Savage, Pamela (januar 1995). «Designing a GUI for Business Telephone users». Association of Computing Machinery. Besøkt 13. september 2014. «...It is at this point that early usability test participants met impasse. The switch connected to our "smart phone" is expecting the typical "dumb end-point"... AT&T's PhoneWriter was demonstrated at the 1993 Comdex Computer Show...»
books.google.com
Polishuk, Paul, red. (Mai 1995). «BellSouth Cellular Corp. Announces DispatchIt Software for Simon». Wireless Telecommunications Newsletter. 5 (5): 9–10. Besøkt 30. juni 2010. «BellSouth Cellular Corp. (BSCC) and PDA Dimensions...announced the commercial availability of DispatchIt, a work order field service application using Simon, BSCC's personal communicator.»
espacenet.com
worldwide.espacenet.com
US patent 5537608, Brent A. Beatty; Francis J. Canova Jr. & Charles S. Lanier et al., "Personal communicator apparatus", issued 1996-07-19, assigned to International Business Machines Corporation
findarticles.com
«IBM's Plans to Ship Simon Put On Hold for Time Being». Mobile Phone News. 4. april 1994. Besøkt 30. juni 2012. «Technical issues, resulting from the integration of Simon's cellular faxing capability, were discovered early in the manufacturing and development cycle as IBM's quality assurance testing was being conducted. IBM will hold up shipments of the device until the bugs are worked out.»
«Ericsson GS88 Preview». Eri-no-moto. 2006. Arkivert fra originalen 11. januar 2012. Besøkt 15. desember 2011.«Arkivert kopi». Arkivert fra originalen 11. januar 2012. Besøkt 26. november 2015.CS1-vedlikehold: Uheldig URL (link)
stockholmsmartphone.org
«Penelope Box». Stockholm Smartphone. 2010. Arkivert fra originalen 3. februar 2012. Besøkt 15. desember 2011.
«Ericsson GS88 Preview». Eri-no-moto. 2006. Arkivert fra originalen 11. januar 2012. Besøkt 15. desember 2011.«Arkivert kopi». Arkivert fra originalen 11. januar 2012. Besøkt 26. november 2015.CS1-vedlikehold: Uheldig URL (link)
«Penelope Box». Stockholm Smartphone. 2010. Arkivert fra originalen 3. februar 2012. Besøkt 15. desember 2011.