D.Helsel Jay, & Jensen Cecil H. (2001). Engineering Drawing and Design, Workbook. American: McGraw -Hill.
Παραπομπή Chicago StyleD.Helsel Jay, και Jensen Cecil H. Engineering Drawing and Design, Workbook. American: McGraw -Hill, 2001.
Παραπομπή MLAD.Helsel Jay, και Jensen Cecil H. Engineering Drawing and Design, Workbook. American: McGraw -Hill, 2001.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.