McJones, Paul (2014-10-21). „Xerox Alto Source Code - The roots of the modern personal computer”. Software Gems: The Computer History Museum Historical Source Code Series. Computer History Museum. Архивирано из оригинала 2015-01-02. г. Приступљено 2015-01-08. „With the permission of the Palo Alto Research Center, the Computer History Museum is pleased to make available, for non-commercial use only, snapshots of Alto source code, executables, documentation, font files, and other files from 1975 to 1987.”
McJones, Paul (2014-10-21). „Xerox Alto Source Code - The roots of the modern personal computer”. Software Gems: The Computer History Museum Historical Source Code Series. Computer History Museum. Архивирано из оригинала 2015-01-02. г. Приступљено 2015-01-08. „With the permission of the Palo Alto Research Center, the Computer History Museum is pleased to make available, for non-commercial use only, snapshots of Alto source code, executables, documentation, font files, and other files from 1975 to 1987.”