Dyfyniad APA

Goetsch, D. L., Nelson, J. A., & Chalk, W. (1994). Technical drawing (3rd ed.). Delmar Publishers.

Dyfyniad Arddull Chicago

Goetsch, David L., John A. Nelson, and William Chalk. Technical Drawing. 3rd ed. Albany, N.Y: Delmar Publishers, 1994.

Dyfyniad MLA

Goetsch, David L., et al. Technical Drawing. 3rd ed. Delmar Publishers, 1994.

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