1. Adell, A., Garcia-Marquez, C., Armario, A., & Gelpi, E. (1988). Chronic stress increases serotonin and noradrenaline in rat brain and sensitizes their responses to a further acute stress’. Journal of Neurochemistry, 50, 1678–1681.
2. Aghajanian, G. K., & Sanders-Bush, E. (2002). Serotonin. In K. L. Davis, D. Charney, J. T. Coyle, & C. Nemeroff (Eds.), Neuropsychopharmacology; The fifth generation of progress. Philadelphia: Lippincott Williams & Wilkins.
3. Agren, H., & Reibring, L. (1994). PET studies of presynaptic monoamine metabolism in depressed patients and healthy volunteers. Pharmacopsychiatry, 27, 2–6.
4. Akil, H. A., & Morano, M. I. (1995). Stress. In F. E. Bloom & D. J. Kupfer (Eds.), Psychopharmacology: The fourth generation of progress (pp. 933–944). New York: Raven Press.
5. Akiskal, H. S. (2005). Mood disorders: Historical introduction and conceptual overview. In B. J. Sadock & V. A. Sadock (Eds.), Kaplan & Sadock’s Comprehensive Textbook of Psychiatry. Philadelphia: Lippincott Williams & Wilkins.