APA (7th ed.) Citation

Guillou, R. B., & Glass, J. J. (1957). A reconnaissance study of the beach sands of Puerto Rico. United States Department of the Interior, Geological Survey.

Chicago Style (17th ed.) Citation

Guillou, Robert B., and Jewell J. Glass. A Reconnaissance Study of the Beach Sands of Puerto Rico. [Washington, D.C.]: United States Department of the Interior, Geological Survey, 1957.

MLA (9th ed.) Citation

Guillou, Robert B., and Jewell J. Glass. A Reconnaissance Study of the Beach Sands of Puerto Rico. United States Department of the Interior, Geological Survey, 1957.