Robertson, S., & Bertling, T. How to draw: Drawing and sketching objects and environments from your imagination.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRobertson, Scott, और Thomas Bertling. How to Draw: Drawing and Sketching Objects and Environments from Your Imagination.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRobertson, Scott, और Thomas Bertling. How to Draw: Drawing and Sketching Objects and Environments from Your Imagination.
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