Gill, R. W. (2007). Rendering with pen and ink (Rev. ed.). Thames and Hudson.
Lua i Stíl Chicago (17ú heag.)Gill, Robert W. Rendering with Pen and Ink. Rev. ed. New York: Thames and Hudson, 2007.
Lua MLA (8ú heag.)Gill, Robert W. Rendering with Pen and Ink. Rev. ed. Thames and Hudson, 2007.
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