APA Format
World Health Organization (WHO) . (). The use of essential drugs, TRS.685. : Geneva WHO 1983
MLA Format
World Health Organization (WHO) . The use of essential drugs, TRS.685. : Geneva WHO 1983,
Australian/Harvard Format
World Health Organization (WHO) . . The use of essential drugs, TRS.685. Geneva WHO 1983, 
Warning: These citations may not always be 100% accurate.