Dyfyniad APA

Ludman, A., & Marshak, S. (2010). Laboratory manual for introductory geology. W.W. Norton.

Dyfyniad Arddull Chicago

Ludman, Allan, and Stephen Marshak. Laboratory Manual for Introductory Geology. New York: W.W. Norton, 2010.

Dyfyniad MLA

Ludman, Allan, and Stephen Marshak. Laboratory Manual for Introductory Geology. W.W. Norton, 2010.

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