Dyfyniad APA

Kelley & David. (1998). The Art of Reasoning (3rd ed.). W. W. Norton & Company.

Dyfyniad Arddull Chicago

Kelley and David. The Art of Reasoning. 3rd ed. New York: W. W. Norton & Company, 1998.

Dyfyniad MLA

Kelley and David. The Art of Reasoning. 3rd ed. W. W. Norton & Company, 1998.

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