Color : a complete guide for artists / by Ralph Fabri.- New York : Watson-Guptill Publications, 1967.- 175 p. : ill. ; 29 cm

Color for the watercolor painter / by Tom Hill.- New York : Watson-Guptill Publications, 1975.- 159 p. : ill. ; 28 cm

Color theory for watercolors / by Michael Wilcox.- New York : Watson-Guptill Publications, [198.].- 61 p. : ill. ; 22 x 28 cm