APA aipamena

Robertson, S., & Bertling, T. How to draw: Drawing and sketching objects and environments from your imagination.

Chicago Style aipamena

Robertson, Scott, and Thomas Bertling. How to Draw: Drawing and Sketching Objects and Environments from Your Imagination.

MLA aipamena

Robertson, Scott, and Thomas Bertling. How to Draw: Drawing and Sketching Objects and Environments from Your Imagination.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.