Martin, J., Kirby, K., Vinall, A., & Gair, A. (1992). The encyclopedia of colored pencil techniques. Rockport Publishers.
Chicago Style (17th ed.) CitationMartin, Judy, Kate Kirby, Ashleigh Vinall, and Angie Gair. The Encyclopedia of Colored Pencil Techniques. Rockport, Mass: Rockport Publishers, 1992.
MLA (9th ed.) CitationMartin, Judy, et al. The Encyclopedia of Colored Pencil Techniques. Rockport Publishers, 1992.
Warning: These citations may not always be 100% accurate.