Dyfyniad APA

D.Helsel Jay, & Jensen Cecil H. (2001). Engineering Drawing and Design, Workbook. American: McGraw -Hill.

Dyfyniad Arddull Chicago

D.Helsel Jay, và Jensen Cecil H. Engineering Drawing and Design, Workbook. American: McGraw -Hill, 2001.

Dyfyniad MLA

D.Helsel Jay, và Jensen Cecil H. Engineering Drawing and Design, Workbook. American: McGraw -Hill, 2001.

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