APA Format
World Health Organization (WHO) . (). Opiates and their alternates for pain and cough relief, TRS.495. : Geneva WHO 1972
MLA Format
World Health Organization (WHO) . Opiates and their alternates for pain and cough relief, TRS.495. : Geneva WHO 1972,
Australian/Harvard Format
World Health Organization (WHO) . . Opiates and their alternates for pain and cough relief, TRS.495. Geneva WHO 1972, 
Warning: These citations may not always be 100% accurate.