References
- M. A. Armstrong, Groups and Symmetry, Springer-Verlag, 1988.
- D. W. Farmer, Groups and Symmetry, American Mathematical Society, 1996.
- J. A. Gallian, Contemporary Abstract Algebra, Houghton Mifflin, 1998.
- B. Grunbaum and G.C. Shephard, Tilings and Patterns, W. H. Freeman, 1989.
- G. E. Martin, Transformation Geometry, Springer-Verlag, 1982.
- R. L. E. Schwarzenberger, The 17 plane symmetry groups, Mathematical Gazette 58 (1974), 123–131.