APA (7th ed.) Citation

Dunbar, C. O. (1949). Historical Geology (2. print.). Wiley.

Chicago Style (17th ed.) Citation

Dunbar, Carl O. Historical Geology. 2. print. London u.a: Wiley, 1949.

MLA (9th ed.) Citation

Dunbar, Carl O. Historical Geology. 2. print. Wiley, 1949.