Shaffer, P. (1990). Painting with four tubes of paint: A simplified palette for watercolorists. Watson Guptill.
Chicago Style (17th ed.) CitationShaffer, Phillip. Painting with Four Tubes of Paint: A Simplified Palette for Watercolorists. New York: Watson Guptill, 1990.
MLA (9th ed.) CitationShaffer, Phillip. Painting with Four Tubes of Paint: A Simplified Palette for Watercolorists. Watson Guptill, 1990.
Warning: These citations may not always be 100% accurate.