Moran, Chuktropolis Welling (2013-01-01). Interactive Time (Ph.D.). La Jolla: University of California, San Diego. ISBN 9781303194450.
Barnet, Belinda (2014-12-01). Memory Machines: The Evolution of Hypertext. Anthem Press. p. 108. ISBN 9781783083442.
Barnet, Belinda (2010-01-01). "Crafting the User-Centered Document Interface: The Hypertext Editing System (HES) and the File Retrieval and Editing System