Dyfyniad APA

Stokes, W. L. (1960). Essentials of earth history: An introduction to historical geology. Prentice-Hall.

Dyfyniad Arddull Chicago

Stokes, William Lee. Essentials of Earth History: An Introduction to Historical Geology. New Jersey: Prentice-Hall, 1960.

Dyfyniad MLA

Stokes, William Lee. Essentials of Earth History: An Introduction to Historical Geology. Prentice-Hall, 1960.

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