APA (7th ed.) Citation

Knowlton, F. H. (1927). Plants of the past: A popular account of fossil plants. Princeton university press.

Chicago Style (17th ed.) Citation

Knowlton, Frank Hall. Plants of the Past: A Popular Account of Fossil Plants. Princeton: Princeton university press, 1927.

MLA (9th ed.) Citation

Knowlton, Frank Hall. Plants of the Past: A Popular Account of Fossil Plants. Princeton university press, 1927.