APA
WHO, . (1987). Prevention and control of intestinal parastic infections. World health organization, Geneva: .
Chicago
WHO, . 1987. Prevention and control of intestinal parastic infections. World health organization, Geneva: .
Harvard
WHO, . (1987). Prevention and control of intestinal parastic infections. World health organization, Geneva: .
MLA
WHO, . Prevention and control of intestinal parastic infections. World health organization, Geneva: . 1987.