APA
WHO/Technical Report Series, . (1997). The use of essential drugs. WHO, Geneva: .
Chicago
WHO/Technical Report Series, . 1997. The use of essential drugs. WHO, Geneva: .
Harvard
WHO/Technical Report Series, . (1997). The use of essential drugs. WHO, Geneva: .
MLA
WHO/Technical Report Series, . The use of essential drugs. WHO, Geneva: . 1997.