Richards, J. (2013). Freehand drawing and discovery: Urban sketching and concept drawing for designers. Wiley.
Chicago-referens (17:e uppl.)Richards, James. Freehand Drawing and Discovery: Urban Sketching and Concept Drawing for Designers. Hoboken, New Jersey: Wiley, 2013.
MLA-referens (8:e uppl.)Richards, James. Freehand Drawing and Discovery: Urban Sketching and Concept Drawing for Designers. Wiley, 2013.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.