Dyfyniad APA
(1954). Minerals Yearbook: 1952, fuels = Vol. 2. United States Gov.Pr.Off.
Dyfyniad Arddull Chicago
Minerals Yearbook: 1952, Fuels = Vol. 2. Washington: United States Gov.Pr.Off, 1954.
Dyfyniad MLA
Minerals Yearbook: 1952, Fuels = Vol. 2. United States Gov.Pr.Off, 1954.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.