Gaya APA

Duelm, B, L., Kopf, M, B. (1989). Teacher's Resource Guide for: Computer - Aided Drafting (-). Amarica: The Goodheart - Willcox.

Gaya MLA

Duelm, Brian, L., Kopf, Michael, B. "Teacher's Resource Guide for: Computer - Aided Drafting". - Amarica: The Goodheart - Willcox, 1989. Text.