GAIR, A. (1994). Drawing: A step-by step guide to drawing techniques. New Holland Publishers.
Lua i Stíl Chicago (17ú heag.)GAIR, Angela. Drawing: A Step-by Step Guide to Drawing Techniques. New Holland Publishers, 1994.
Lua MLA (9ú heag.)GAIR, Angela. Drawing: A Step-by Step Guide to Drawing Techniques. New Holland Publishers, 1994.
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