Dyfyniad APA

Giesecke, F. E. (2009). Technical drawing (13th ed.). Pearson Prentice-Hall.

Dyfyniad Arddull Chicago

Giesecke, Frederick Ernest. Technical Drawing. 13th ed. Upper Saddle River, N.J: Pearson Prentice-Hall, 2009.

Dyfyniad MLA

Giesecke, Frederick Ernest. Technical Drawing. 13th ed. Pearson Prentice-Hall, 2009.

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