1. Åberg-Wistedt, A., Ågren, H., Ekselius, L., Bengtston, F., & Åkerblad, A. (2000). Sertraline versus paroxetine in major depression: clinical outcome after six months of continuous therapy. Journal of Clinical Psychopharmacology, 20, 645–652.
2. Abraham, K. (1927). Notes on the psychoanalytic investigation and treatment of manic-depressive insanity and allied conditions. In: Selected Papers of Karl Abraham (p. 418–502). London: Hogarth Press and the Institute of Psychoanalysis.
3. Akiskal, H.S., Hirschfeld, R.M.A., Yerevanian, B.I. (1983). The relationship of personality to affective disorders: a critical review. Archives of General Psychiatry, 40, 801–810.
4. Akiskal, H.S.(1989). Validating affective personality types. In: Robins, L.N., & Barrett, J.E. (eds.). The validity of psychiatric diagnosis. New York: Raven Press.
5. Akkerhuis, G.W., Kupka, R.W., Groenestijn, M.A.C. e.a. (1996). PDQ-4+ Vragenlijst voor Persoonlijkheidskenmerken. Lisse: Swets & Zeitlinger.