APA (7th ed.) Citation

(1989). Proceedings of the Twenty First Annual ACM Symposium Seattle, Washington May 15-17, 1989. Association for Computing Machinery.

Chicago Style (17th ed.) Citation

Proceedings of the Twenty First Annual ACM Symposium Seattle, Washington May 15-17, 1989. New York: Association for Computing Machinery, 1989.

MLA (8th ed.) Citation

Proceedings of the Twenty First Annual ACM Symposium Seattle, Washington May 15-17, 1989. Association for Computing Machinery, 1989.