Salt of the Earth: The Story of a Film, by Herbert J. Biberman. Harbor Electronic Publishing, New York (2nd edition, 2004): 1965. See: Cineaste review of book.
Scott Henkel and Vanessa Fonseca. “Fearless Speech and the Discourse of Civility in Salt of the Earth.” Chiricú, vol. 1, no. 1, 2016, pp.19–38. www.jstor.org/stable/10.2979/chiricu.1.1.03.