1. Cotton, F. A. (1971). Chemical Application of Group Theory ,Wiley, New York.
2. Herzberg, G. (1945). Infrared and Raman Spectra ,Van Nostrand, New York.
3. Hollas, J. M. (1972). Symmetry in Molecules ,Chapman and Hall, London.
4. Hollas, J. M. (1975). Symmetrie von Molek ülen ,Walter de Gruyter, Berlin.
5. Jaffé, H. H., und Orchin, M. (1977). Symmetry in Chemistry ,Krieger, New York.