APA (7th ed.) Citation

Riggs, E. S. (1932). The geological history and evolution of the horse. Field museum of natural history.

Chicago Style (17th ed.) Citation

Riggs, Elmer S. The Geological History and Evolution of the Horse. Chicago: Field museum of natural history, 1932.

MLA (9th ed.) Citation

Riggs, Elmer S. The Geological History and Evolution of the Horse. Field museum of natural history, 1932.

Warning: These citations may not always be 100% accurate.