ChallengeTBIshihara"Ishihara Charts"(PDF). www.challengetb.org. USAID. Retrieved 26 October 2023.
color-blindness.com
Fluck, Daniel (23 March 2010). "Color Blindness Tests". Colblinder. Retrieved 3 December 2013.
eyemagazine.com
Kindel, Eric. "Ishihara". Eye Magazine. Retrieved 3 December 2013.
ubi.pt
dfisica.ubi.pt
Ishihara, Shinobu (1972). Tests for Colour-Blindness(PDF). Kanehara Shuppan. Archived from the original(PDF) on 8 December 2020. Retrieved 17 June 2020.
web.archive.org
Ishihara, Shinobu (1972). Tests for Colour-Blindness(PDF). Kanehara Shuppan. Archived from the original(PDF) on 8 December 2020. Retrieved 17 June 2020.
