Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.