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