Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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