APA Format
World Health Organization (WHO) . (). 2,4-Dichlorophenoxyacetic acid (2,4-D) environmental aspects. : Geneva WHO 1989
MLA Format
World Health Organization (WHO) . 2,4-Dichlorophenoxyacetic acid (2,4-D) environmental aspects. : Geneva WHO 1989,
Australian/Harvard Format
World Health Organization (WHO) . . 2,4-Dichlorophenoxyacetic acid (2,4-D) environmental aspects. Geneva WHO 1989, 
Warning: These citations may not always be 100% accurate.