Stokes, W. L. (1966). Essentials of earth history. An introduction to historical geology (2a. ed.). Prentice-Hall.
Cita Chicago (17th ed.)Stokes, William Lee. Essentials of Earth History. An Introduction to Historical Geology. 2a. ed. Englewood Cliffs: Prentice-Hall, 1966.
Cita MLA (9th ed.)Stokes, William Lee. Essentials of Earth History. An Introduction to Historical Geology. 2a. ed. Prentice-Hall, 1966.
Atenció: Aquestes cites poden no estar 100% correctes.