APA Format
World Health Organization (WHO) . (). Hormonal steroids in contraception: report of a WHO Scientific Group/WHO. : Geneva WHO 1968
MLA Format
World Health Organization (WHO) . Hormonal steroids in contraception: report of a WHO Scientific Group/WHO. : Geneva WHO 1968,
Australian/Harvard Format
World Health Organization (WHO) . . Hormonal steroids in contraception: report of a WHO Scientific Group/WHO. Geneva WHO 1968, 
Warning: These citations may not always be 100% accurate.