APA
World Health Organization, . (1991). Basic tests for pharmaceutical dosage forms. World Health Organization, Geneva: .
Chicago
World Health Organization, . 1991. Basic tests for pharmaceutical dosage forms. World Health Organization, Geneva: .
Harvard
World Health Organization, . (1991). Basic tests for pharmaceutical dosage forms. World Health Organization, Geneva: .
MLA
World Health Organization, . Basic tests for pharmaceutical dosage forms. World Health Organization, Geneva: . 1991.