^Eldredge, N.; Gould, S. J. (1972). "Punctuated equilibria: an alternative to phyletic gradualism". In Schopf, T. J. M. (ed.). Models in Paleobiology. San Francisco: Freeman, Cooper. pp. 82–115.
^Moore, Michael E.; Novak, Jeannie (2010). Game Industry Career Guide. Delmar: Cengage Learning. p. 7. ISBN978-1-4283-7647-2. In 1966, Ralph H. Baer ... pitched an idea ... to create interactive games to be played on the television. Over the next two years, his team developed the first video game system—and in 1968, they demonstrated the "Brown Box," a device on which several games could be played and that used a light gun to shoot targets on the screen. After several more years of development, the system was licensed by Magnavox in 1970 and the first game console system, the Odyssey, was released in 1972 at the then high price of $100.
^Spärck Jones, K. (1972). "A Statistical Interpretation of Term Specificity and Its Application in Retrieval". Journal of Documentation. 28: 11–21. CiteSeerX10.1.1.115.8343. doi:10.1108/eb026526.