* R. Keith Sawyer (2001) [https://journals.sagepub.com/doi/10.1177/0049124102239079].
* R. Keith Sawyer (2001) [https://journals.sagepub.com/doi/10.1177/0049124102239079].
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* [http://www.cs.sjsu.edu/faculty/pearce/modules/lectures/abs/as/interactions.htm] - by DEPARTMENT OF COMPUTER SCIENCE
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* [http://www.cs.sjsu.edu/faculty/pearce/modules/lectures/abs/as/interactions.htm Artificial Societies ] - by Department of computer science in College of Science of San Jose State University