Dyfyniad APA

United States. Energy Information Administration. Office of Oil and Gas. (1994). Petroleum marketing annual. The Office : Supt. of Docs., U.S. G.P.O. [distributor.

Dyfyniad Arddull Chicago

United States. Energy Information Administration. Office of Oil and Gas. Petroleum Marketing Annual. Washington, D.C.: The Office : Supt. of Docs., U.S. G.P.O. [distributor, 1994.

Dyfyniad MLA

United States. Energy Information Administration. Office of Oil and Gas. Petroleum Marketing Annual. The Office : Supt. of Docs., U.S. G.P.O. [distributor, 1994.

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