APA

SIGMOD/PODS 91, Association for Computing Machinery, ACM Special Interest Group on Algorithms and Computation Theory, ACM Special Interest Group on Artificial Intelligence & ACM Special Interest Group on Management of Data. (1991). Proceedings of the tenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems. New York, NY: ACM.

Chicago

SIGMOD/PODS 91, Association for Computing Machinery, ACM Special Interest Group on Algorithms and Computation Theory, ACM Special Interest Group on Artificial Intelligence and ACM Special Interest Group on Management of Data. 1991. Proceedings of the tenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems. New York, NY: ACM.

Harvard

SIGMOD/PODS 91, Association for Computing Machinery, ACM Special Interest Group on Algorithms and Computation Theory, ACM Special Interest Group on Artificial Intelligence and ACM Special Interest Group on Management of Data. (1991). Proceedings of the tenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems. New York, NY: ACM.

MLA

SIGMOD/PODS 91, Association for Computing Machinery, ACM Special Interest Group on Algorithms and Computation Theory, ACM Special Interest Group on Artificial Intelligence and ACM Special Interest Group on Management of Data. Proceedings of the tenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems. New York, NY: ACM. 1991.