1. and , Guide to Material Standards and their use in Color Measurement, ISCC Technical Report 59-1.
2. NIST Standard Reference Materials Catalog, 1992–1993.
3. Pressing Problems and Projected National Needs in Optical Radiation Measurements. Council for Optical Radiation Measurements, 5th report. Sept. 1989.
4. Propagation of random errors in spectrophotometric colorimetry