1. American Psychiatric Association 1980 Diagnostic and Statistical Manual of Mental Disorders, 3rd ed. Washington, DC: American Psychiatric Association.
2. Beerber, A.R. and Pies, R.W. 1983 Non-melancholic Depressive Syndrome. Journal of Nervous and Mental Disease 171:3–9.
3. Beijing Medical College et al. 1980 Psychiatry. Beijing: People's Health Publ. Pp. 294–320.
4. Chen Zhongshun 1955 A Preliminary Report of Group Therapy on Neurasthenics in Nanjing Psychiatric Hospital. Chinese Journal of Neurology and Psychiatry 1:100–103 (In Chinese).
5. Jiliyarofski, B.A. 1964 Textbook of Psychiatry, 2nd ed. (trans. by Beijing and Hunan Medical College) Beijing: People's Health Publ. Pp. 341–357.