Chalk, W. S., & William S. Chalk; David L. Goetsch. (2005). Technical Drawing: Workbook. Albany, N.Y: Delmar Publishers.
Dyfyniad Arddull ChicagoChalk, William S., và William S. Chalk; David L. Goetsch. Technical Drawing: Workbook. Albany, N.Y: Delmar Publishers, 2005.
Dyfyniad MLAChalk, William S., và William S. Chalk; David L. Goetsch. Technical Drawing: Workbook. Albany, N.Y: Delmar Publishers, 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.