^'Inside Macintosh', by Caroline Rose, Bradley Hacker, Apple Computer, Inc. Published 1985, Addison-Wesley Pub. Co. ISBN 0-201-05409-4. Original from the University of Michigan; Digitized Nov 16, 2007.
^Visual editing on unix By B. Srinivasan, K. Ranai Published 1989 World Scientific Text editors (Computer programs) 182 pages ISBN 9971-5-0770-6