Stokes, W. L. (1966). Essentials of earth history: An introduction to historical geology (2d ed.). Englewood Cliffs, N.J.: Prentice-Hall.
Dyfyniad Arddull ChicagoStokes, William Lee. Essentials of Earth History: An Introduction to Historical Geology. 2d ed. Englewood Cliffs, N.J.: Prentice-Hall, 1966.
Dyfyniad MLAStokes, William Lee. Essentials of Earth History: An Introduction to Historical Geology. 2d ed. Englewood Cliffs, N.J.: Prentice-Hall, 1966.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.