APA Format
World Health Organization (WHO) . (). Clinical aspects of oral gestogens, TRS.326. : Geneva WHO 1966
MLA Format
World Health Organization (WHO) . Clinical aspects of oral gestogens, TRS.326. : Geneva WHO 1966,
Australian/Harvard Format
World Health Organization (WHO) . . Clinical aspects of oral gestogens, TRS.326. Geneva WHO 1966, 
Warning: These citations may not always be 100% accurate.