Cita APA (7th ed.)

Pearl, R. M. (1955). How to Know the minerals and rocks. New America Library.

Cita Chicago (17th ed.)

Pearl, Richard M. How to Know the Minerals and Rocks. New York: New America Library, 1955.

Cita MLA (9th ed.)

Pearl, Richard M. How to Know the Minerals and Rocks. New America Library, 1955.