Dyfyniad APA

Stokes, W. L., & Judson, S. (1968). Introduction to geology, physical and historical. Prentice-Hall.

Dyfyniad Arddull Chicago

Stokes, William Lee, and Sheldon Judson. Introduction to Geology, Physical and Historical. Englewood Cliffs, N.J: Prentice-Hall, 1968.

Dyfyniad MLA

Stokes, William Lee, and Sheldon Judson. Introduction to Geology, Physical and Historical. Prentice-Hall, 1968.

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