APA

United States, . (1979). The scope of drug abuse in Puerto Rico: supply and demand reduction : hearings. Washington: U.S. Govt. Print. Off.

Chicago

United States, . 1979. The scope of drug abuse in Puerto Rico: supply and demand reduction : hearings. Washington: U.S. Govt. Print. Off.

Harvard

United States, . (1979). The scope of drug abuse in Puerto Rico: supply and demand reduction : hearings. Washington: U.S. Govt. Print. Off.

MLA

United States, . The scope of drug abuse in Puerto Rico: supply and demand reduction : hearings. Washington: U.S. Govt. Print. Off. 1979.