Gaya APA

Duelm, B, L. (1989). Applications Workbook: Computer-Aided Drafting (-). Amarica: The Goodheart - Willcox.

Gaya MLA

Duelm, Brian, L. "Applications Workbook: Computer-Aided Drafting". - Amarica: The Goodheart - Willcox, 1989. Text.