Iverson, Kenneth E., "Automatic Data Processing: Chapter 6: A programming language" Archived June 4, 2009, at the Wayback Machine, 1960, Draft copy for Brooks and Iverson 1963 book, Automatic Data Processing.
Процитовано 2010-02-03.  Iverson, Kenneth E., «Automatic Data Processing: Chapter 6: A programming language» Архівовано 4 June 2009 у en:Wayback Machine., 1960, DRAFT copy for Brooks and Iverson 1963 book, «Automatic Data Processing».