1. Schizophrenia, manic depressive psychosis and socio-economic status;Tietze;Am. J. Sociol.,1941
2. Depression: Clinical, Experimental and Theoretical Aspects;Beck,1967
3. The Epidemiology of Depression;Silverman,1968
4. Depression: disease, reaction, or posture?;Hill;Am. J. Psychiat.,1968
5. The Beck depression inventory with medical patients;Schwab;Acta psychiat. neurol. scand.,1967