Sketching : drawing techniques for product designers.

MLA

Eissen, Koos, and Roselien Steur. Sketching : Drawing Techniques for Product Designers. Amsterdam: Bis, 2007.

APA

Eissen, K., & Steur, R. (2007). Sketching : drawing techniques for product designers. Amsterdam: Bis.

Chicago

Eissen, Koos, and Roselien Steur. Sketching: Drawing Techniques for Product Designers. Amsterdam: Bis, 2007.