APA Format
World Health Organization (WHO) . (). Youth and drugs, report of a WHO study group (TRS.516). : Geneva WHO 1973
MLA Format
World Health Organization (WHO) . Youth and drugs, report of a WHO study group (TRS.516). : Geneva WHO 1973,
Australian/Harvard Format
World Health Organization (WHO) . . Youth and drugs, report of a WHO study group (TRS.516). Geneva WHO 1973, 
Warning: These citations may not always be 100% accurate.