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