What are some good books on general theories about the complex in psychology?
Antonia Wolff . Introduction to the basics of the complex psychology. Berlin 1935
Antonia Wolff . The concept of the archetype in the complex psychology and its relationship to international science. Berlin 1950
Antonia Wolff . The cultural significance of complex psychology. Festschrift for the 60th Jung's birthday 1935Studies of Jungian psychology. Zurich 1959, Einsiedeln 1981
Andrew Samuels, Bani Shorter and Fred Plaut. A Critical Dictionary of Jungian Analysis, Routledge: New York, 1986, pp. 33-35.
Joseph Cambray, Linda Carter. Analytical psychology: contemporary perspectives in Jungian analysis
Hans Dieckmann, Boris Matthews (Translator), Complexes: Diagnosis and Therapy in Analytical Psychology
A good resource for the field is:
Google Scholar and Jstor are good places to search for current scholarly articles.