Dyfyniad APA

Copi, I. M., & Cohen, C. (2005). Introduction to logic (12th ed.). Pearson/Prentice Hall.

Dyfyniad Arddull Chicago

Copi, Irving M., and Carl Cohen. Introduction to Logic. 12th ed. Upper Saddle River, N.J: Pearson/Prentice Hall, 2005.

Dyfyniad MLA

Copi, Irving M., and Carl Cohen. Introduction to Logic. 12th ed. Pearson/Prentice Hall, 2005.

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