Dyfyniad APA

Riordon, P. H. (1981). Geology of asbestos deposits. Society of Mining Engineers.

Dyfyniad Arddull Chicago

Riordon, P. H. Geology of Asbestos Deposits. New York: Society of Mining Engineers, 1981.

Dyfyniad MLA

Riordon, P. H. Geology of Asbestos Deposits. Society of Mining Engineers, 1981.

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