- American Federation of Information Processing Societies: Proceedings of the AFIPS '67 Spring Joint Computer Conference, April 18-20, 1967, Atlantic City, New Jersey, USA. Volume 30 of AFIPS Conference Proceedings, AFIPS / ACM / Thomson Book Company, Washington D.C., 1968.
- American Federation of Information Processing Societies: Proceedings of the AFIPS '68 Fall Joint Computer Conference, December 9-11, 1968, San Francisco, California, USA - Part II. Volume 33 of AFIPS Conference Proceedings, AFIPS / ACM / Thomson Book Company, Washington D.C., 1968.
- American Federation of Information Processing Societies: AFIPS Conference Proceedings: 1968 Spring Joint Computer Conference, Atlantic City, NJ, USA, 30 April - 2 May 1968. Volume 32 of AFIPS Conference Proceedings, Thomson Book Company, Washington D.C., 1968.
- American Federation of Information Processing Societies: AFIPS Conference Proceedings: 1969 Spring Joint Computer Conference, Boston, MA, USA, May 14-16, 1969. Volume 34 of AFIPS Conference Proceedings, AFIPS Press, 1968.
- American Federation of Information Processing Societies: Proceedings of the AFIPS '68 Fall Joint Computer Conference, December 9-11, 1968, San Francisco, California, USA - Part I. Volume 33 of AFIPS Conference Proceedings, AFIPS / ACM / Thomson Book Company, Washington D.C., 1968.