E.G. Try Book or 2021 for a year (or maybe just an author / topic / keyword).
Agazarian, Y.M. (1969). The agency as a change agent. In A.H. Goldberg (Ed.), Blindness research: The expanding frontiers. University Park, PA and London, UK: Penn State Press.
Agazarian, Y.M. (1982). Role as a bridge construct in understanding the relationship between the individual and the group. In M. Pines & L. Rafaelson (Eds.), The individual and the group, boundaries and interrelations, Vol. I, Theory (pp. 181-192). New York, NY: Plenum Press.
Agazarian, Y.M. (1983). Some advantages of applying multi-dimensional thinking to the teaching, practice and outcomes of group psychotherapy. International Journal of Group Psychotherapy, 33(2), 243-247. doi: 10.1080/00207284.1983.11490871
Agazarian, Y.M. (1983). Theory of the invisible group applied to individual and group-as-a-whole interpretations. GROUP: The Journal of the Eastern Group Psychotherapy Society, 7(2), 27-37. doi: jstor.org/stable/41718187
Agazarian, Y.M. (1986). Application of Lewin's life space concept to the individual and group-as-a-whole systems in group psychotherapy. In E. Stivers & S. Wheelan (Eds.), The Lewin legacy: Field theory in current practice (pp. 101-112). New York, NY: Springer-Verlag.
Agazarian, Y.M. (1989). Group-as-a-whole systems theory and practice. GROUP: The Journal of the Eastern Group Psychotherapy Society, 13(3-4), 131-154. doi: jstor.org/stable/41718522
Agazarian, Y.M. (1989). The invisible group: An integrational theory of group-as-a-whole, The 12th Annual Foulkes Memorial Lecture. Group Analysis: The Journal of the Group Analytic Society, 22(4), 74-96. doi: 10.1177/0533316489224001
Agazarian, Y.M. (1991). Systems theory and group psychotherapy: From there-and-then to here-and-now. The International Forum of Group Psychotherapy, 1(3).
Agazarian, Y.M. (1992). Friends Series I. Functional Subgrouping.
Agazarian, Y.M. (1997). Systems-centered therapy for groups. New York, NY: Guilford. Re-printed in paperback (2004). London, UK: Karnac Books.
Agazarian, Y.M. (2006). Systems-centered practice: Selected papers on group psychotherapy. London, UK: Karnac Books.
Agazarian, Y.M. (2014). Patrick de Maré. Group Analysis, 47(4), 473-480. doi: 10.1177/0533316414557224
Agazarian, Y.M., & Gantt, S.P. (2000). Autobiography of a theory: Developing a theory of living human systems and its systems-centered practice. London, UK: Jessica Kingsley.
Agazarian, Y.M., Gantt, S.P., & Carter, F.B. (2021). Systems-centered training: An illustrated guide for applying a theory of living human systems. London, UK: Routledge.
Bateson, G. (1972). Steps to an ecology of mind. New York, NY: Ballantine Books.
Beck, A.P. (1981). A study of group phase development and emergent leadership. GROUP: The Journal of the Eastern Group Psychotherapy Society, 5 (4), 48-54.
Bennis, W.G., & Shepard, H.A. (1956). A theory of group development. Human Relations, 9(4), 415-437. doi: 10.1177/001872675600900403
Bertalanffy, L. von (1968). General system theory: Foundations, development, applications (Rev. ed. 1976). New York, NY: George Braziller.
Bertalanffy, L. von (1969). General systems (Rev. ed.). New York, NY: George Braziller.
Bion, W.R. (1961). Experiences in groups and other papers. London, UK: Tavistock.
Bowlby J. (1969). Instinctive behavior: An alternative model. In Attachment and loss, Vol. 1, Attachment. New York, NY: Basic Books.
Cartwright, D., & Zander, A. (1960). Group dynamics: Research and theory. 2nd ed. New York, NY: Elmsford, Row, Peterson.
Coleman, A.D., & Bexton, W.H. (Eds.) (1975). The group relations reader: Volume I. Washington, D.C.: A. K. Rice Institute.
Coleman, A.D., & Geller, M.H. (Eds.) (1985). The group relations reader: Volume II. Washington, D.C.: A. K. Rice Institute.
Davanloo, H. (1987). Clinical manifestations of superego pathology. International Journal of Short-Term Psychotherapy, 2(4), 225-254.
de Maré, P.B., Piper, R., & Thompson, S. (1991). Koinonia: From hate, through dialogue, to culture in the large group. London, UK: Karnac Books.
Durkin, H. (1972). Group therapy and general systems theory. In C. J. Sager & H. Singer Kaplan (Eds.), Progress in group and family therapy. New York, NY: Brunner/Mazel.
Durkin, J.E. (Ed.). (1981). Living groups: Group psychotherapy and general systems theory. New York, NY: Brunner/Mazel.
Festinger, L. (1957). A theory of cognitive dissonance. Evanston, IL: Row, Peterson.
Foulkes, S.H. & Anthony, E.J. (1957). Group psychotherapy: The psychoanalytic approach. London, UK: Karnac Books.
Foulkes, S.H. (1964). Therapeutic group analysis. London, UK: Allen and Unwin. Re-printed (1984). London, UK: Karnac Books.
Hopper, E., & Weinberg, H. (Eds.) (2011). The social unconscious in persons, groups, and societies: Volume 1: Mainly theory. London, UK: Karnac Books.
Horwitz, L. (1983). Projective identification in diads and groups. International Journal of Group Psychotherapy, 33, 259-279.
Howard, A., & Scott, R.A. (1965). A proposed framework for the analysis of stress in the human organism. Journal of Applied Behavioral Science, 10, 141-160.
Korzybski, A. (1994). Science and sanity: An introduction to non-Aristotelian systems and general semantics (5th ed.). Englewood, NJ: Institute of General Semantics.
Kreeger, L.C. (Ed.) (1975). The large group: Dynamics and therapy. London, UK: Constable.
Lenn, R. & Stefano, K. (Eds.) (2012). Small, large and median groups: The work of Patrick de Maré. London, UK: Karnac Books.
Lewin, K. (1951). Field theory in social science. New York, NY: Harper & Row.
McCluskey, U. (2005). To be met as a person: The dynamics of attachment in professional encounters. London, UK: Karnac Books.
McCluskey, U., & Hooper, C. (Eds.) (2000). Psychodynamic perspectives on abuse: The cost of fear. London, UK & Philadelphia, PA: Jessica Kingsley.
McCullough, L. (1991). Short term dynamic psychotherapy: A cross theoretical analysis of change mechanisms. In R.C. Curtis & G. Striker (Eds.), How people change. New York, NY: Plenum Press.
Miller, J.G. (1978). Living systems. New York, NY: McGraw-Hill.
Pines, M., & Schermer, V. (Eds.) (1994). Ring of fire: Primitive object relations and affect in group psychotherapy. London, UK: Routledge, Chapman & Hall.
Rossi, E.L. (Ed.) (1980). The collected papers of Milton H. Erickson, Vols. I & IV. Irvington Publishers.
Ruesch, J., & Bateson, G. (1951). Communication: The social matrix of psychiatry. New York, NY: Norton.
Shannon, C.E., & Weaver, W. (1964). The mathematical theory of communication. Urbana, IL: University of Illinois Press.
Simon, A., & Boyer, E.G. (1971). Mirrors for behaviors: An anthology of classroom observation instruments. Vols. 1-17. Philadelphia, PA: Research for Better Schools.
Stivers, E., & Wheelan, S. (Eds.) (1986). The Lewin legacy: Field theory in current practice. New York, NY: Springer-Verlag.
Systems-Centered Training and Research Institute (Ed.) (2010). Systems-centered theory and practice: The contribution of Yvonne Agazarian. Livermore, CA: WingSpan Press. Reprint (2011). London, UK: Karnac Books.
Winnicott, D.W. (1971). Transitional objects and transitional phenomena. In Playing and reality (pp. 1-25). London, UK: Tavistock.