Credits and Acknowledgements:

Earl Swartslander, “Generations of Calculators” IEEE Annals of the history of computing, Vol 17. Publication date, Fall 1995 https://ieeexplore.ieee.org/document/397076 

 “Canon U.S.A. Inc, “P23-DHV-3” USA.Canon.com, Date Accessed September 15, 2021, https://www.usa.canon.com/internet/portal/us/home/products/details/calculators/printing-calculators/p23-dhv

"CANON P23-DH III CALENDAR & CLOCK," MAL Accession Number 2020.12.88, The Media Archeology Lab, University of Colorado Boulder, https://www.mediaarchaeologylab.com/collection/canon-p23-dh-iii-calendar-clock-cb154cd

Woerner, Joerg. “Find Here the Original Press Release Dated March 13, 1998:” DATAMATH, July 27, 2020. http://www.datamath.org/Graphing/TI-89.htm.

McDaniel, Alex. "Use of Calculators in High School Mathematics." (2020).

Loewus, Liana. "Will Online Tools Make Texas Instruments' Graphing Calculators Obsolete?" Education Week, June 14, 2017, 18. Gale In Context: College (accessed November 3, 2021). https://link.gale.com/apps/doc/A496922519/CSIC?u=coloboulder&sid=summon&xid=51ae7bf8.