Dyfyniad APA

United States. Bureau of Narcotics & United States. Federal Narcotics Control Board. (1931). Traffic in opium and other dangerous drugs. U.S. Govt. Print. Off.

Dyfyniad Arddull Chicago

United States. Bureau of Narcotics and United States. Federal Narcotics Control Board. Traffic in Opium and Other Dangerous Drugs. Washington: U.S. Govt. Print. Off, 1931.

Dyfyniad MLA

United States. Bureau of Narcotics and United States. Federal Narcotics Control Board. Traffic in Opium and Other Dangerous Drugs. U.S. Govt. Print. Off, 1931.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.