APA (7th ed.) Citation

Ager, D. V. (1961). Introducing geology: The earth's crust considered as history. Faber and Faber.

Chicago Style (17th ed.) Citation

Ager, Derek V. Introducing Geology: The Earth's Crust Considered as History. London: Faber and Faber, 1961.

MLA (8th ed.) Citation

Ager, Derek V. Introducing Geology: The Earth's Crust Considered as History. Faber and Faber, 1961.