[PRE92] Pressman, R., Software Engineering: A Practitioner's Approach. McGraw-Hill, 1992.
[TIC82] Tichy, W. Design, Implementation, and Evaluation of a Revision Control System, Proceedings: 6th International Conference on Software Engineering pp. 58-67. IEEE Computer Society Press, 1982
[TIC85] Tichy, W. RCS - A System For Version Control, Software - Practice and Experience, vol 15 number 7, July 1985. pp. 637-654.

The RCS software is available for a wide variety of UNIX and other platforms.