Goel, A., Kunda, M., Joyner, D. and Vattam, S. (2013) “Learning about Representational Modality: Design and Programming Projects for Knowledge-Based AI”, Proceedings of the AAAI Conference on Artificial Intelligence, 27(3), pp. 1586-1591. doi: 10.1609/aaai.v27i3.19004.