Cita APA (7th ed.)

Holmes, A., & Duff, P. M. D. (1994). Holmes' Principles of Physical Geology (4th ed.). Chapman & Hall / ELBS.

Cita Chicago (17th ed.)

Holmes, Arthur, i P. McL. D. Duff. Holmes' Principles of Physical Geology. 4th ed. London: Chapman & Hall / ELBS, 1994.

Cita MLA (9th ed.)

Holmes, Arthur, i P. McL. D. Duff. Holmes' Principles of Physical Geology. 4th ed. Chapman & Hall / ELBS, 1994.