APA (7th ed.) Citation

Whitlock, H. P. (1941). The story of the gems: A popular handbook. Emerson Books, inc..

Chicago Style (17th ed.) Citation

Whitlock, Herbert Percy. The Story of the Gems: A Popular Handbook. New York: Emerson Books, inc., 1941.

MLA (9th ed.) Citation

Whitlock, Herbert Percy. The Story of the Gems: A Popular Handbook. Emerson Books, inc., 1941.