APA Format
World Health Organization (WHO) . (). Health effects of combined exposures in the work environment, TRS.662. : Geneva WHO 1981
MLA Format
World Health Organization (WHO) . Health effects of combined exposures in the work environment, TRS.662. : Geneva WHO 1981,
Australian/Harvard Format
World Health Organization (WHO) . . Health effects of combined exposures in the work environment, TRS.662. Geneva WHO 1981, 
Warning: These citations may not always be 100% accurate.