1. S. J. Abas and A. S. Salman, Symmetries of Islamic Geometrical Patterns, London, World Scientific, 1995.

2. M. C. Escher, Regelmatige vlakverdeling (1958), translated into English and reproduced in M. C. Escher, His Life and Complete Graphic Work, F. H. Bool et al, eds., New York, Harry Abrams, 1982. Also (a different translation)in Escher on Escher: Exploring the Infinite, New York, Harry Abrams, 1989.

3. B. Grünbaum and G. C. Shephard, Tilings and Patterns, New York, W. H. Freeman, 19875.

4. D. Schattschneider, Visions of Symmetry: Notebooks ,Periodic Drawings, and Related Work of M. C. Escher, New York, W. H. Freeman, 1990.

5. Daniel Sheets Dye, Chinese Lattice Designs, New York, Dover Publications, 1974. Reprint of A Grammar of Chinese Lattices, Harvard University Pr., 1937 and 1949.

6. Leonardo da Vinci, Codex Atlanticus, f 328 v-a (1508-1510). Reproduced in Leonardo Architect , by Carlo Pedretti, Translated by Sue Brill, New York, Rizzoli International Publications, 1985.