Bell, John T. "Protection." University of Illinois, Chicago, Accessed 11 July 2022. URL: https://
Bell, John T. "Security." University of Illinois, Chicago, Accessed 11 July 2022. URL: https://
Chapter 11: Security.
Hailperin, Max (2019). Operating Systems and Middleware: Supporting Controlled Interaction. (Revised edition 1.3.1) S.l.: Gustavus Adolphus College. This work is licensed under the Creative Commons Attribution-ShareAlike3.0 Unported License. URL: https://