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- Blair, Cynthia (October 1, 2007). "1952: Sidney Rosenthal Invents the Marker Pen". Newsday. Archived from the original on October 1, 2007. Retrieved June 22, 2017.
- Siegelaub, Marc (January 13, 2003). "Indelibly Devoted / Marker-maker's widow fights for his fame". Lifestyle section. Newsday. Archived from the original on June 29, 2011. Retrieved June 22, 2017. (Subscription required (help)).
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