Dyfyniad APA

Thomas, S. N. (1997). Practical reasoning in natural language (4th ed.). Prentice Hall.

Dyfyniad Arddull Chicago

Thomas, Stephen N. Practical Reasoning in Natural Language. 4th ed. Upper Saddle River, N. J: Prentice Hall, 1997.

Dyfyniad MLA

Thomas, Stephen N. Practical Reasoning in Natural Language. 4th ed. Prentice Hall, 1997.

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