Howard, John H. (1976). "Signaling in monitors". ICSE '76 Proceedings of the 2nd international conference on Software engineering. International Conference on Software Engineering. Los Alamitos, CA, USA: IEEE Computer Society Press. pp. 47–52.
Hansen, Per Brinch (1993). "Monitors and concurrent Pascal: a personal history". HOPL-II: The second ACM SIGPLAN conference on History of programming languages. History of Programming Languages. New York, NY, USA: ACM. pp. 1–35. doi:10.1145/155360.155361. ISBN0-89791-570-4.