Whitten, D. G. A., & Brooks, J. R. V. (1972). The Penguin Dictionary of geology. Penguin Books.
Cita Chicago (17th ed.)Whitten, D. G. A., i J. R. V. Brooks. The Penguin Dictionary of Geology. [Harmondsworth, Eng.]: Penguin Books, 1972.
Cita MLA (9th ed.)Whitten, D. G. A., i J. R. V. Brooks. The Penguin Dictionary of Geology. Penguin Books, 1972.
Atenció: Aquestes cites poden no estar 100% correctes.