Cita APA (7a ed.)

Kinghorn, J. R., Clauset, K., & Willis, C. L. (1979). A guide to four essential themes. Charles F. Kettering Foundation.

Cita Chicago Style (17a ed.)

Kinghorn, Jon Rye, Karl Clauset, y Charles L. Willis. A Guide to Four Essential Themes. Dayton, Ohio: Charles F. Kettering Foundation, 1979.

Cita MLA (9a ed.)

Kinghorn, Jon Rye, et al. A Guide to Four Essential Themes. Charles F. Kettering Foundation, 1979.