Robertson, S., & Bertling, T. (2013). How to draw : drawing and sketching objects and environments from your imagination / by Scott Robertson with Thomas Bertling: Drawing and sketching objects and environments from your imagination (First edition.). Design Studio Press.
Chicago Style (17th ed.) CitationRobertson, Scott, and Thomas Bertling. How to Draw : Drawing and Sketching Objects and Environments from Your Imagination / by Scott Robertson with Thomas Bertling: Drawing and Sketching Objects and Environments from Your Imagination. First edition. Culver City, CA: Design Studio Press, 2013.
MLA (9th ed.) CitationRobertson, Scott, and Thomas Bertling. How to Draw : Drawing and Sketching Objects and Environments from Your Imagination / by Scott Robertson with Thomas Bertling: Drawing and Sketching Objects and Environments from Your Imagination. First edition. Design Studio Press, 2013.