Obituary by Elena Anne Corie Marchisotto in the Journal of Humanistic Mathematics (July 2020)
Obituary by Ulf Persson in the European Mathematical Society Newsletter (June 2020)
Newspaper obituary: https://www.legacy.com/obituaries/name/reuben-hersh-obituary?pid=195087881
Obituary on Facebook by Reuben's son Daniel: https://www.facebook.com/daniel.hersh.5/posts/2285069924927419
"A Tribute to Reuben Hersh" from the Santa Fe Institute: https://www.santafe.edu/news-center/news/tribute-reuben-hersh
Wikipedia: https://en.wikipedia.org/wiki/Reuben_Hersh
Video: Interview with Reuben Hersh (2014) https://www.ams.org/publications/authors/books/postpub/mbk-83
Interview (1997): "What kind of thing is a number?" https://www.edge.org/conversation/reuben_hersh-reuben-hersh-1927-2020
Curriculum Vitae as of about 2011: https://sites.google.com/site/reubenhersharticlesetc/home/curriculum-vitae
Articles by Reuben up to about May 2012: https://sites.google.com/site/reubenhersharticlesetc/welcome/articles
Reuben on Google Scholar: https://scholar.google.com/scholar?as_vis=1&q=author:%22Reuben+Hersh
Humanistic Math page in Brazil (in Portuguese): https://www.matematicahumanista.com.br/quemsomos