APA Format
World Health Organization (WHO) . (). Disability prevention and rehabilitation, TRS.668. : Geneva WHO 1981
MLA Format
World Health Organization (WHO) . Disability prevention and rehabilitation, TRS.668. : Geneva WHO 1981,
Australian/Harvard Format
World Health Organization (WHO) . . Disability prevention and rehabilitation, TRS.668. Geneva WHO 1981, 
Warning: These citations may not always be 100% accurate.