Turtle Geometry: The Computer as a Medium for Exploring Mathematics. Abelson, H. & diSessa , A. A. MIT Press, Cambridge, MA, 1981.
bibtex   
@book{Abelson1981,
  author    = {Harold Abelson and Aandrea A. diSessa},
  title     = {{Turtle Geometry: The Computer as a Medium for
              Exploring Mathematics}},
  year      = 1981,
  publisher = {MIT Press},
  address   = {Cambridge, MA}
}

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