References
Abelson, H., & diSessa, A. (1980). Turtle Geometry. Cambridge, MA: MIT Press.
Acknowledgments
Thanks are due to Francisco (Tito) Salas, Jim Love, and Mike Levy of the Fiske Planetarium in Boulder, whose help and collaboration made it possible to develop the spherical-turtle language and interface. Thanks also to Uri Wilensky of Northwestern University for many wonderful collaborative conversations on the subject of introducing mathematical ideas through the use of novel display devices; without his efforts, the project described here would never have been initiated.
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Eisenberg, M. Computational Diversions: Turtle Really and Truly Escapes the Plane. Int J Comput Math Learning 15, 73–79 (2010). https://doi.org/10.1007/s10758-010-9161-y
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DOI: https://doi.org/10.1007/s10758-010-9161-y