APA Format
World Health Organization (WHO) . (). Evaluation of methods for the treatment of mental disorders, TRS 812. : Geneva WHO 1991
MLA Format
World Health Organization (WHO) . Evaluation of methods for the treatment of mental disorders, TRS 812. : Geneva WHO 1991,
Australian/Harvard Format
World Health Organization (WHO) . . Evaluation of methods for the treatment of mental disorders, TRS 812. Geneva WHO 1991, 
Warning: These citations may not always be 100% accurate.