Eunice Ingham is considered the "mother of reflexology". She introduced her work to the non-medical community. She wrote two books "Stories the feet Can Tell (1938) and "Stories The Feet Have Told" (1951). Her Nephew Dwight Byers continues her work to this day at the International Institute of Reflexology in Florida.
Other books:
(1902) Pressure Points, Their Origin and Significance by Dr. Alfons Cornelius
(1917) Zone Therapy by Dr. William H. FitzGerald
(1945) Zone Therapy and Gland Reflexes by Eunice Ingham
(1996) Helping Yourself with Foot Reflexology by Mildred Carter
(2005) Let’s Read Our Feet! Second Edition by Jane Sheehan
(2005) The Reflexology Atlas by Bernard C. Kolster M.D., Astrid Waskowiak M.D.
(2009) The Reflexology Bible: The Definitive book by Louise Keet
(2013) The Reflexology Healing Bible: Release Your Inner Energy with Your Fingertips to Relieve Pain, Reduce Stress and Promote Healing by Denise Whichello Brown
(2015) Revisiting reflexology: Concept, evidence, current practice, and practitioner training by Nurul Haswani Embong, Yee Chang Soh, Long Chiau Ming, and Tin Wui Wong (https://pubmed.ncbi.nlm.nih.gov)