APA Format
World Health Organization (WHO) . (). Vector ecology, expert of a WHO scientific group. : Geneva WHO 1972
MLA Format
World Health Organization (WHO) . Vector ecology, expert of a WHO scientific group. : Geneva WHO 1972,
Australian/Harvard Format
World Health Organization (WHO) . . Vector ecology, expert of a WHO scientific group. Geneva WHO 1972, 
Warning: These citations may not always be 100% accurate.