WALKER, T. D. (1989). Perspective Sketches. Van Nostrand Reinhold.
Lua i Stíl Chicago (17ú heag.)WALKER, Theodore D. Perspective Sketches. Van Nostrand Reinhold, 1989.
Lua MLA (8ú heag.)WALKER, Theodore D. Perspective Sketches. Van Nostrand Reinhold, 1989.
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