Willcox, D. J. (1969). Modern leather design. Watson-Guptill Pub.
Lua i Stíl Chicago (17ú heag.)Willcox, Donald J. Modern Leather Design. New York: Watson-Guptill Pub, 1969.
Lua MLA (9ú heag.)Willcox, Donald J. Modern Leather Design. Watson-Guptill Pub, 1969.
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