APA
World Health Organization, . (1993). Principles for evaluating chemical effects on the aged population. World Health Organization, Geneva: .
Chicago
World Health Organization, . 1993. Principles for evaluating chemical effects on the aged population. World Health Organization, Geneva: .
Harvard
World Health Organization, . (1993). Principles for evaluating chemical effects on the aged population. World Health Organization, Geneva: .
MLA
World Health Organization, . Principles for evaluating chemical effects on the aged population. World Health Organization, Geneva: . 1993.