ANSI - American National Standards Institute, 25 West 43rd Street, (between 5th and 6th Avenues), 4 floor, New York, NY 10036, Tel: (212) 642 4900, Fax: (212) 398 0023, http://www.ansi.org/

The Bar Code Book-Reading, Printing and Specification of Bar Code Symbols. Roger C. Palmer. Helmers Publishing, Inc., Fourth Edition. 2001, ISBN: 0911261133.

Reading between the lines: an introduction to bar code technology. Craig K. Harmon and Russ Adams, Helmers Publishing, Inc., Fourth Edition. 1989, ISBN: 0911261001.

Revolution at the Checkout Counter : The Explosion of the Bar Code. Stephen A. Brown, Harvard University Press 1997, ISBN: 0674767209.

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Quick Check® 600/800 Series User’s Guide

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Hand Held Products manual Quick Check 600/800 Series User’s Guide