^Sloane, Sarah (2000) Digital Fictions: Storytelling in a Material World, Ablex Publishing Corporation, ISBN 978-1-56750-482-8, p. 168
^Slator, Brian M. et al "From Dungeons to Classrooms: The Evolution of MUDs as Learning Environments", in Jain, Lakhmi C., Tedman, Raymond A. & Tedman, Debra K. (eds.) (2007) Evolution of Teaching and Learning Paradigms in Intelligent Environment, Springer, ISBN 978-3-540-71973-1, p. 121-2
