1. Priebe, Dick (January 1961). "From Teen Age Business Tycoon…To Concentration Camps...To Freedom. For Nathan Zepell, Sheaffer Development Engineer, Riga, Latvia, and its 'Ghetto' is a Lifetime Away." Sheaffer Review. Fort Madison, IA.
2. Weitzel, Tony (1961). "The Toy that Saved 30 Lives." Chicago Daily News. Chicago, IL.
3. Zepelovitch, Nathan, "Fountain Pen with Retractable Tip Enclosure," U.S. Patent #2559555, issued July 3, 1951.
4. Zepelovitch, Nathan, "Rocking Side Clip to Extend and Retract Ballpoint Pen Cartridge," U.S. Patent #2881736, issued April 14, 1959.
5. Zepelovitch, Nathan, "Rocking Side Clip to Extend and Retract Ballpoint Pen Cartridge," U.S. Patent #3075496, issued January 29, 1963.
6. "Nathan Zepell." Forbes Magazine. Jersey City, NJ. August 1, 1974.
7. Holcombe, Chet (December 22, 1974). "Nathan Zepell is a Believer.” Santa Barbara News-Press. Santa Barbara, CA.
8. Zepell, Nathan A. (January 1, 1975). "Replace the ill will with more good will". Santa Barbara News-Press. Santa Barbara, CA.
9. Zepell, Nathan A., "Flat Dual Cartridge Ballpoint Pen with Side Clip Mechanism for Reciprocal Movement,"“ U.S. Patent #3871775, issued March 18, 1975.
10. Zepell, Nathan A. (June 25, 1975). "America's Amazing Success Machine." Business Round Table, recorded in the Congressional Record of the Senate. Washington D.C. p. 20687.
11. Holcombe, Chet (February 19, 1978). "Road from concentration camp led Nathan Zepell to success." Santa Barbara, News-Press. Santa Barbara, CA.
12. "Zepell – A Profile in Courage." Athol Daily News. Greenfield, MA. April 28, 1980. p. 10.
13. Zepell, Nathan A. (1981). "Survival and Success." Proceedings of the Million Dollar Round Table – The Spirit of Commitment. New York, NY. pp. 335–339.
14. "Nathan Zepell Obituary." Santa Barbara News-Press. Santa Barbara, CA. March 1, 1982.
15. Calhoun, Ricky-Dale (Summer 2007). "Arming David: The Haganah's Illegal Arms Procurement Network in the United States, 1945-49." Journal of Palestine Studies. 36:4.
