Freiberger, Paul; Michael Swaine (2000). Fire in the Valley: The Making of the Personal Computer. New York, NY: McGraw-Hill. pp. 53. ISBN0-07-135892-7. "While walking through Harvard Square one day, Allen spotted the Popular Electronics cover that features the Altair. … Allen ran to tell Bill that he thought their big break had finally come. Bill agreed."
Wallace, James; Jim Erickson (1992). Hard Drive: Bill Gates and the Making of the Microsoft Empire. John Wiley & Sons. pp. 81-83. ISBN0-471-56886-4."Harvard officials had found out that he (Gates) and Allen had been making extensive use of the university's PDP-10 to develop a commercial product. The officials were not pleased." The computer was funded by the Department of Defense and was under the control of Professor Thomas Cheatham. "Although DARPA was funding the PDP-10 at Harvard, there was no written policy regarding its use."
Issacson, Walter (20 de septiembre de 2013). «Dawn of a Revolution». Harvard Gazatte(en inglés). Consultado el 25 de abril de 2015.
startupgallery.org
«We have a BASIC». New Mexico Museum of Natural History and Science. Archivado desde el original el 14 de noviembre de 2010. Consultado el 18 de abril de 2007.
vpabogados.wordpress.com
Traducción de la carta de Bill Gates al Homebrew Computer Club 1976 «Copia archivada». Archivado desde el original el 2 de octubre de 2013. Consultado el 22 de septiembre de 2013.
web.archive.org
«We have a BASIC». New Mexico Museum of Natural History and Science. Archivado desde el original el 14 de noviembre de 2010. Consultado el 18 de abril de 2007.
Traducción de la carta de Bill Gates al Homebrew Computer Club 1976 «Copia archivada». Archivado desde el original el 2 de octubre de 2013. Consultado el 22 de septiembre de 2013.
