APA Format
World Health Organization (WHO) . (). Health needs of adolescents, TRS.609. : Geneva WHO 1977
MLA Format
World Health Organization (WHO) . Health needs of adolescents, TRS.609. : Geneva WHO 1977,
Australian/Harvard Format
World Health Organization (WHO) . . Health needs of adolescents, TRS.609. Geneva WHO 1977, 
Warning: These citations may not always be 100% accurate.