This palette is three items in one: a mixing palette, the first correct colour mixing wheel and a comprehensive guide to colour harmony and contrast.
Depicting the Colours in Water by Michael Wilcox
Essential Colour Theory for Urban Sketchers
Depicting the Colors in Textures - School of Colour US
The Michael Wilcox School of Colour
Find Your Favourite Colour Palette - For Artists and Surface Pattern Designers, Katia Galante
Using the Michael Wilcox Palette and Colour Mixing Workbook : Michail Wilcox : Free Download, Borrow, and Streaming : Internet Archive
The Educated Palette (Excerpt) - The Artist's Road
Oils and Acrylics Palette - School of Colour US
Mixing Greens: Wilcox, Michael: 9781931780131: : Books
handprint : color wheels
Getting the Most from the Wilcox Mixing Palette – The Net Loft