Dictionary definitions:
Kast, V. (2005). Complex (Analytical Psychology). In A. de Mijolla (Ed.), International dictionary of psychoanalysis (pp. 320-321). Macmillan Reference.
Samuels, A., Shorter, B., & Plaut, F. (1986). Complex. In A critical dictionary of Jungian analysis (pp. 33-35). Routledge.
Sharp, D. (Ed.). (1991). Complex. In Jung lexicon: A primer of terms & concepts. http://www.cgjungpage.org/learn/jung-lexicon#complex
Guidebook:
Hopcke, R. H. (1999). Complex. In A guided tour of the collected works of C. G. Jung (2nd ed., pp. 18-20). Shambhala.
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Index to the Collected Works:
Forryan, B., & Glover, J. M. (1979). Complex(es) [index term]. In H. Read et al. (Eds.), The collected works of C. G. Jung: Vol. 20. General index to the collected works of C. G. Jung. Princeton University Press.
To Begin:
Jung, C. G. (1973). Psychoanalysis and association experiments (D. Riviere & L. Stein, Trans.). In H. Read et al. (Eds.), The collected works of C. G. Jung: Vol. 2. Experimental researches (pp. 288-317). Princeton University Press. (Original work published 1906) https://doi.org/10.1515/9781400850914.288
Jung, C. G. (1973). The psychological diagnosis of evidence (D. Riviere & L. Stein, Trans.). In H. Read et al. (Eds.), The collected works of C. G. Jung: Vol. 2. Experimental researches (pp. 318-352). Princeton University Press. (Original work published 1906) https://doi.org/10.1515/9781400850914.318
Jung, C. G. (1973). The psychopathological significance of the association experiment (D. Riviere & L. Stein, Trans.). In H. Read et al. (Eds.), The collected works of C. G. Jung: Vol. 2. Experimental researches (pp. 408-425). Princeton University Press. (Original work published 1906) https://doi.org/10.1515/9781400850914.408
Jung, C. G. (1969). A review of the complex theory (R. F. C. Hull, Trans.). In H. Read et al. (Eds.), The collected works of C. G. Jung: Vol. 8. Structure and dynamics of the psyche (2nd ed., pp. 92-104). Princeton University Press. (Original work published 1948) https://doi.org/10.1515/9781400850952.92
To Go Deeper:
Jung, C. G. (1973). Association, dream, and hysterical symptom (D. Riviere & L. Stein, Trans.). In H. Read et al. (Eds.), The collected works of C. G. Jung: Vol. 2. Experimental researches (pp. 353-407). Princeton University Press. (Original work published 1906) https://doi.org/10.1515/9781400850914.353
Jung, C. G. (1973). The family constellation (D. Riviere & L. Stein, Trans.). In H. Read et al. (Eds.), The collected works of C. G. Jung: Vol. 2. Experimental researches (pp. 466-479). Princeton University Press. (Original work published 1909) https://doi.org/10.1515/9781400850914.466
Jung, C. G. (1969). The psychological foundations of belief in spirits (R. F. C. Hull, Trans.). In H. Read et al. (Eds.), The collected works of C. G. Jung: Vol. 8. Structure and dynamics of the psyche (2nd ed., pp. 301-318). Princeton University Press. (Original work published 1948) https://doi.org/10.1515/9781400850952.300
Related Works:
Jung, C. G. (1969). On the nature of the psyche (R. F. C. Hull, Trans.). In H. Read et al. (Eds.), The collected works of C. G. Jung: Vol. 8. Structure and dynamics of the psyche (2nd ed., pp. 159-234). Princeton University Press. (Original work published 1954) https://doi.org/10.1515/9781400850952.159
Jung, C. G. (1969). On psychic energy (R. F. C. Hull, Trans.). In H. Read et al. (Eds.), The collected works of C. G. Jung: Vol. 8. Structure and dynamics of the psyche (2nd ed., pp. 3-66). Princeton University Press. (Original work published 1928) https://doi.org/10.1515/9781400850952.3
Jung, C. G. (1968). Psychological aspects of the mother archetype (R. F. C. Hull, Trans.). In H. Read et al. (Eds.), The collected works of C. G. Jung: Vol. 9 pt. 1. Archetypes and the collective unconscious (2nd ed., pp. 75-110). Princeton University Press. (Original work published 1954) https://doi.org/10.1515/9781400850969.75
Cope, T. A. (2006). Fear of Jung: The complex doctrine and emotional science. Karnac.
Jacobi, J. (1959). Complex/Archetype/Symbol in the Psychology of C. Jung. Princeton University Press.
Kast, V. (2014). Complexes and imagination. The Journal of Analytical Psychology, 59(5), 680–694. https://doi.org/10.1111/1468-5922.12113
Meier, C. A. (1992). The theory of complexes. In R. K. Papadopoulos (Ed.), Carl Gustav Jung: Critical assessments: Vol. 2: The structure and dynamics of the psyche (pp. 201-209). Routledge.
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Noll, R. (1992). Multiple Personality, Dissociation, and C. G. Jung's Complex Theory. In R. K. Papadopoulos (Ed.), Carl Gustav Jung: Critical assessments: Vol. 2: The structure and dynamics of the psyche (pp. 210-227). Routledge.