Workshop on Data Abstraction, Databases, and Conceptual Modelling Pingree Park, Colo, United States. National Bureau of Standards, Brodie, M. L., & Zilles, S. N. (1980). Proceedings of Workshop on Data Abstraction, Databases, and Conceptual Modelling, Pingree Park, Colorado, June 23-26, 1980. Association for Computing Machinery ; May be ordered from ACM Order Dept..

Workshop on Data Abstraction, Databases, and Conceptual Modelling Pingree Park, Colo, United States. National Bureau of Standards, Michael L. Brodie, e Stephen N. Zilles. Proceedings of Workshop on Data Abstraction, Databases, and Conceptual Modelling, Pingree Park, Colorado, June 23-26, 1980. New York, N.Y. : Baltimore, MD: Association for Computing Machinery ; May be ordered from ACM Order Dept., 1980.

Workshop on Data Abstraction, Databases, and Conceptual Modelling Pingree Park, Colo, et al. Proceedings of Workshop on Data Abstraction, Databases, and Conceptual Modelling, Pingree Park, Colorado, June 23-26, 1980. Association for Computing Machinery ; May be ordered from ACM Order Dept., 1980.