Robertson, S., & Bertling, T. (2013). How to draw: Drawing and sketching objects and environments from your imagination (First edition.). Designstudio Press.
Chicago Style (17th ed.) CitationRobertson, Scott, and Thomas Bertling. How to Draw: Drawing and Sketching Objects and Environments from Your Imagination. First edition. Culver City, Calif: Designstudio Press, 2013.
MLA (8th ed.) CitationRobertson, Scott, and Thomas Bertling. How to Draw: Drawing and Sketching Objects and Environments from Your Imagination. First edition. Designstudio Press, 2013.
Warning: These citations may not always be 100% accurate.