APA
UNITED NATIONS DRUG SUPERVISORY BODY, UNITED NATIONS DRUG SUPERVISORY BODY, . (1956). Estimated world requirements of narcotic drugs in 1957. Geneva: UN.
Chicago
UNITED NATIONS DRUG SUPERVISORY BODY, UNITED NATIONS DRUG SUPERVISORY BODY, . 1956. Estimated world requirements of narcotic drugs in 1957. Geneva: UN.
Harvard
UNITED NATIONS DRUG SUPERVISORY BODY, UNITED NATIONS DRUG SUPERVISORY BODY, . (1956). Estimated world requirements of narcotic drugs in 1957. Geneva: UN.
MLA
UNITED NATIONS DRUG SUPERVISORY BODY, UNITED NATIONS DRUG SUPERVISORY BODY, . Estimated world requirements of narcotic drugs in 1957. Geneva: UN. 1956.