APA
WHO, . (1990). Guidelines on sterilization and disinfection methods effective against human immunodeficiency virus (HIV). Geneva: World Health Organization.
Chicago
WHO, . 1990. Guidelines on sterilization and disinfection methods effective against human immunodeficiency virus (HIV). Geneva: World Health Organization.
Harvard
WHO, . (1990). Guidelines on sterilization and disinfection methods effective against human immunodeficiency virus (HIV). Geneva: World Health Organization.
MLA
WHO, . Guidelines on sterilization and disinfection methods effective against human immunodeficiency virus (HIV). Geneva: World Health Organization. 1990.