Fiedler, Ryan. The Unix Tutorial / Part 3: Unix in the Microcomputer Marketplace. archive.org. October 1983, s. 132. Dostupné online [cit. 2015-01-30].
Dennis M. Ritchie. Unix Advertising [online]. former Bell Labs Computing and Mathematical Sciences Research [cit. 2014-02-17]. Dostupné v archivu pořízeném dne 2013-01-02.