Jay D. Helsel, & Thomas E. French. (2003). Mechanical Drawing Board & Cad Techniques 13edt (13th ed.). Usa: Mc Graw Hill.
Chicago Style CitationJay D. Helsel, and Thomas E. French. Mechanical Drawing Board & Cad Techniques 13edt. 13th ed. Usa: Mc Graw Hill, 2003.
MLA CitationJay D. Helsel, and Thomas E. French. Mechanical Drawing Board & Cad Techniques 13edt. 13th ed. Usa: Mc Graw Hill, 2003.
Warning: These citations may not always be 100% accurate.