Numeric keypad (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Numeric keypad" in English language version.

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archive.org

Held, Gilbert (1999). "Chapter 2 Terminal Devices. Numeric Keypads". Understanding data communications (6th ed.). Indianapolis, Ind. ; [Great Britain] : New Riders. p. 58. ISBN 978-0-7357-0036-9.

Pasewark, William Robert; Knowlton, Todd (1995-01-01). Ten-Key Skill Builder for Computers. South-Western Educational Pub. ISBN 9780538629195.
Stroman, James; Wilson, Kevin; Wauson, Jennifer (2011-09-01). Administrative Assistant's and Secretary's Handbook. AMACOM Div American Mgmt Assn. p. 224. ISBN 9780814417607.

Microsoft (23 May 2019) [2014]. "mscorlib/system/consolekey.cs". Microsoft/ReferenceSource repository. GitHub. At line 106. Retrieved 24 June 2019.