Hessler, Orville (March 1953). "Garment Tag Equipment"(PDF). 1952 Proceedings of the Review of Input and Output Equipment Used in Computer Systems. Joint AIEE-IRE-ACM Computer Conference. New York, NY: American Institute of Electrical Engineers. pp. 122–125. OCLC2719407. Retrieved 27 April 2011.
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Hessler, Orville (March 1953). "Garment Tag Equipment"(PDF). 1952 Proceedings of the Review of Input and Output Equipment Used in Computer Systems. Joint AIEE-IRE-ACM Computer Conference. New York, NY: American Institute of Electrical Engineers. pp. 122–125. OCLC2719407. Retrieved 27 April 2011.