Cita APA (7a ed.)

Pimentel, G. C., & Spratley, R. D. (1971). Understanding chemistry. Holden-Day, Inc.

Cita Chicago Style (17a ed.)

Pimentel, George C., y Richard D. Spratley. Understanding Chemistry. San Francisco [etc.]: Holden-Day, Inc, 1971.

Cita MLA (9a ed.)

Pimentel, George C., y Richard D. Spratley. Understanding Chemistry. Holden-Day, Inc, 1971.