- Michael L. Brodie, Stephen N. Zilles, editors, Proceedings of the Workshop on Data Abstraction, Databases and Conceptual Modelling, Pingree Park, Colorado, June 23-26, 1980. Volume 11 of ACM Press, 1981.
- Y. Edmund Lien, editor, Proceedings of the 1981 ACM SIGMOD International Conference on Management of Data, Ann Arbor, Michigan, April 29 - May 1, 1981. ACM Press, 1981.