Landa & Fairchild 2005, "Charting Color from the Eye of the Beholder", http://markfairchild.org/PDFs/PAP21.pdf
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Nickerson 1940 "History of the Munsell Color System and Its Scientific Application" https://doi.org/10.1364/JOSA.30.000575
1943 OSA Munsell renotations report: https://doi.org/10.1364/JOSA.33.000385
Nickerson 1976 "History of the Munsell Color System, Company, and Foundation" (3 parts) https://doi.org/10.1111/j.1520-6378.1976.tb00003.x https://doi.org/10.1111/j.1520-6378.1976.tb00017.x ahttps://doi.org/10.1111/j.1520-6378.1976.tb00028.x
Nickerson 1983 obituary for Alex Munsell, https://munsell.com/color-blog/alexander-ector-orr-munsell/
Kuehni, "The early development of the Munsell system" https://doi.org/10.1002/col.10002