APA (7th ed.) Citation

Wheat, C. I., Grabhorn, E. E., & Grabhorn, J. B. (1949). Books of the California gold rush: A centennial selection. Colt Press.

Chicago Style (17th ed.) Citation

Wheat, Carl I., Edwin E. Grabhorn, and Jane Bissell Grabhorn. Books of the California Gold Rush: A Centennial Selection. San Francisco: Colt Press, 1949.

MLA (9th ed.) Citation

Wheat, Carl I., et al. Books of the California Gold Rush: A Centennial Selection. Colt Press, 1949.