APA
World Health Organization, . (1993). The Urban health crisis. W.H.O., Geneva: .
Chicago
World Health Organization, . 1993. The Urban health crisis. W.H.O., Geneva: .
Harvard
World Health Organization, . (1993). The Urban health crisis. W.H.O., Geneva: .
MLA
World Health Organization, . The Urban health crisis. W.H.O., Geneva: . 1993.