APA Format
World Health Organization (WHO) . (). Environmental health in urban development, TRS.807. : Geneva WHO 1991
MLA Format
World Health Organization (WHO) . Environmental health in urban development, TRS.807. : Geneva WHO 1991,
Australian/Harvard Format
World Health Organization (WHO) . . Environmental health in urban development, TRS.807. Geneva WHO 1991, 
Warning: These citations may not always be 100% accurate.