APA Format
World Health Organization (WHO) . (). Oral enteric bacterial vaccines, TRS.500. : Geneva WHO 1972
MLA Format
World Health Organization (WHO) . Oral enteric bacterial vaccines, TRS.500. : Geneva WHO 1972,
Australian/Harvard Format
World Health Organization (WHO) . . Oral enteric bacterial vaccines, TRS.500. Geneva WHO 1972, 
Warning: These citations may not always be 100% accurate.