Ladd, M. F. C. (1989). Symmetry in molecules and crystals. Ellis Horwood.
Lua i Stíl Chicago (17ú heag.)Ladd, M. F. C. Symmetry in Molecules and Crystals. Chichester, West Sussex, England: Ellis Horwood, 1989.
Lua MLA (9ú heag.)Ladd, M. F. C. Symmetry in Molecules and Crystals. Ellis Horwood, 1989.
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