[Bo1] Bool, F.H., Kist, J.R., Locher, J.L., and Wierda, F., editors, M. C. Escher, His life and Complete Graphic Work, Harry N. Abrahms, Inc., New York, 1982. ISBN 0-8109-0858-1

[Co1] Coxeter, H. S. M., "Crystal symmetry and its generalizations," Royal Society of Canada(3), 51 (1957), 1-13.

[Co2] Coxeter, H. S. M., "The non-Euclidean symmetry of Escher's Picture `Circle Limit III'," Leonardo, 12 (1979), 19-25, 32.

[Co3] Coxeter, H. S. M., "The Trigonometry of Escher's Woodcut 'Circle Limit III'," The Mathematical Intelligencer, 18 no. 4 (1996) 42-46. Updated and corrected version appears in [Sc2] below.

[Co4] Coxeter, H. S. M., "Angels and devils," in The Mathematical Gardner, David A. Klarner, editor, Wadsworth International, 1981 (out of print). ISBN 0-534-98015-5
Republished as: Mathematical Recreations: A Collection in Honor of Martin Gardner, David A. Klarner, editor, Dover Publishers, 1998. ISBN 0-486-40089-1

[De1] Deraux, Martin, Interactive tessellation web site: http://www.math.utah.edu/~deraux/tessel/

[Du1] Dunham, D., "Hyperbolic symmetry," Computers and Mathematics with Applications, Part B 12 (1986), no. 1-2, 139-153.

[Du2] Dunham, D., "Transformation of Hyperbolic Escher Patterns," Visual Mathematics (an electronic journal), 1, No. 1, March, 1999.

[Du3] Dunham, D., "Families of Escher Patterns," in [Sc2] below, pp. 286-296.

[Es1] Official M. C. Escher Web site, published by the M.C. Escher Foundation and Cordon Art B.V. http://www.mcescher.com/

[Fe1] Ferguson, Helaman, Web site: http://www.helasculpt.com/gallery/index.html

[Go1] Goodman-Strauss, Chaim, "Compass and straightedge in the Poincaré disk," Amer. Math. Monthly, 108 (2001), no. 1, 38-49.

[Gr1] Greenberg, Marvin, Euclidean and Non-Euclidean Geometries, 3rd Edition, W. H. Freeman and Co., 1993. ISBN 0-7167-2446-4

[Ha1] Hatch, Don, Hyperbolic tessellations web site: Hyperbolic Planar Tesselations [Ha1].

[He1] Henderson, David W., and Daina Taimina, Experiencing Geometry: In Euclidean, Spherical and Hyperbolic Spaces, 2nd Ed., Prentice Hall, 2000. ISBN 0130309532 Web link: http://www.mathsci.appstate.edu/~sjg/class/3610/hen.html

[Jo1] Joyce, David, Hyperbolic tessellations web site: http://aleph0.clarku.edu/~djoyce/poincare/poincare.html

[Ka1] Kaplan, Craig S., "Computer generated Islamic star patterns," Bridges 2000, Mathematical Connections in Art, Music and Science. Winfield, Kansas, USA, 28-30 July 2000. ISBN 0-9665201-2-2 Web link: Abstract and PDF

[Ma1] Magnus, Wilhelm, Noneuclidean Tesselations and Their Groups, Academic Press, 1974. ISBN 0-12-465450-9

[Sc1] Schattschneider, Doris, Visions of Symmetry: Notebooks, Periodic Drawings, and Related Work of M. C. Escher, W. H. Freeman, New York, 1990. ISBN 0-7167-2126-0

[Sc2] Schattschneider, Doris, and Michele Emmer, editors, M. C. Escher's Legacy: A Centennial Celebration, Springer Verlag, 2003. ISBN 3-540-42458-X