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2. The basic concepts and attributes of colour order systems
3. Winterthur, Switzerland, personal communication, 1985.
4. AIC Annotated Bibliography on Color Order Systems, available at no charge except for postage and a $1.00 handling charge (in U.S. funds) from Mimeoform Services, Inc., Rear, 4805 Prince George's Avenue, Beltsville, MD 20705.
5. A Color Notation, 1st-4th eds., Ellis, Boston, 1906–1916; 5th-11th eds., Munsell Color Co., Baltimore, 1919–1961.