APA Format
World Health Organization (WHO) . (). Primary prevention of essential hypertension, TRS.686. : Geneva WHO 1983
MLA Format
World Health Organization (WHO) . Primary prevention of essential hypertension, TRS.686. : Geneva WHO 1983,
Australian/Harvard Format
World Health Organization (WHO) . . Primary prevention of essential hypertension, TRS.686. Geneva WHO 1983, 
Warning: These citations may not always be 100% accurate.