APA

van Rijsbergen C. J., Association for Computing Machinery & ACM Special Interest Group on Information Retrieval. (1981). Proceedings of the 3rd annual ACM conference on Research and development in information retrieval. Kent, UK: Butterworth & Co.

Chicago

van Rijsbergen C J, Association for Computing Machinery and ACM Special Interest Group on Information Retrieval. 1981. Proceedings of the 3rd annual ACM conference on Research and development in information retrieval. Kent, UK: Butterworth & Co.

Harvard

van Rijsbergen C. J., Association for Computing Machinery and ACM Special Interest Group on Information Retrieval. (1981). Proceedings of the 3rd annual ACM conference on Research and development in information retrieval. Kent, UK: Butterworth & Co.

MLA

van Rijsbergen C J, Association for Computing Machinery and ACM Special Interest Group on Information Retrieval. Proceedings of the 3rd annual ACM conference on Research and development in information retrieval. Kent, UK: Butterworth & Co. 1981.