Lewis, D. (1984). Pencil drawing techniques. Watson-Guptill Publications.
Tohutoru Kātū Chicago (17th ed.)Lewis, David. Pencil Drawing Techniques. New York: Watson-Guptill Publications, 1984.
Tohutoro MLA (9th ed.)Lewis, David. Pencil Drawing Techniques. Watson-Guptill Publications, 1984.
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