Kuipers, Benjamin, Edward A. Feigenbaum, Peter E. Hart, and Nils J. Nilsson. “Shakey: From Conception to History”. AI Magazine 38, no. 1 (March 31, 2017): 88-103. Accessed June 2, 2020. https://www.aaai.org/ojs/index.php/aimagazine/article/view/2716.