• E.A. Abbott (1884). Flatland: A Romance of Many Dimensions. Boston: Little Brown.
• N.J. Cornish, D.N. Spergel and G.D. Starkman (1998). Circles in the Sky: Finding Topology with the Microwave Background Radiation. Classical and Quantum Gravity, 15(9), 2657-2670. To access a copy of this work on the web, click here.
• N.J. Cornish and J.R. Weeks (1998). Measuring the Shape of the Universe. Notices of the American Mathematical Society, 45(11), 1463-1471. An on-line version of this paper is available here.
• D. Epstein and C. Gunn (1991). Supplement to Not Knot. Wellesley, MA: A.K. Peters.
• D. Falk (1999). An Interconnected Universe? Exploring the Topology of the Cosmos. Sky and Telescope, 98(1), 44-51.
• Geometry Supercomputer Center (1991). Not Knot (a videotape). Minneapolis: University of Minnesota. The Geometry Spupercomputer Center is now known as the "Geometry Center." To see its homepage, click here. To see the Not Knot homepage, click here.
• Geometry Center (1995). The Shape of Space (a videotape). Minneapolis: University of Minnesota. Click here to go to the Geometry Center's homepage. To see the Shape of Space homepage which includes links to some curriculum materials (some of which emphasize visualizing the flat 3-torus and its kin), click here.
• M. Lachieze-Rey and J.P. Luminet (1995). Cosmic Topology. Physics Reports, 254(3), 136-214. To access a copy of this work on the web, click here.
• J.P. Luminet, G.D. Starkman, and J.R. Weeks (1999). Is Space Finite? Scientific American, April 1999, 90-97. For an on-line version of the paper, click here.
• I. Peterson (1998). Circles in the Sky: Detecting the Shape of the Universe. Science News, 153, 123-125. For an on-line version of this paper, click here.
• T.P. Snow and K.R. Brownsberger (1997). Universe: Origins and Evolution. Belmont, CA: Wadsworth Publishing.
• G.D. Starkman et al. (1998). Special Issue Featuring Papers from the Topology of the Universe Conference, Ohio, October 1997. Classical and Quantum Gravity, 15(9), 2529-2731. To see an on-line version of the table of contents of this issue, click here.
• G.D. Starkman (1998). Topology and Cosmology. Classical and Quantum Gravity, 15(9), 2529-2538.
• W.P. Thurston (1997). Three-Dimensional Geometry and Topology, Edited by S. Levy. Princeton: Princeton University Press.
• J.R. Weeks (1985). The Shape of Space: How to Visualize Surfaces and Three-Dimensional Manifolds. New York: Marcel Dekker.

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