Dyfyniad APA

Jensen, C. H., & Helsel, J. D. (1979). Engineering drawing and design (2d ed.). Gregg Division, McGraw-Hill.

Dyfyniad Arddull Chicago

Jensen, Cecil Howard, and Jay D. Helsel. Engineering Drawing and Design. 2d ed. New York: Gregg Division, McGraw-Hill, 1979.

Dyfyniad MLA

Jensen, Cecil Howard, and Jay D. Helsel. Engineering Drawing and Design. 2d ed. Gregg Division, McGraw-Hill, 1979.

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