1. Kaluza, T.: (1921). Zum Unitatsproblem der Physik. Sitz. Press. Akad. Wiss. phys. math.k1, 966
2. Klein, O.: Z. Phys. 37, 895 (1926)
3. De Sabbatta, V., Schmutzer, E.: Unified Filed Theories of More than 4 Dimensions Including Exact Solution. World Scientific, Singapore (1983)
4. Lee, H.C.: An Introduction to Kaluza-Klein Theories. World Scientific, Singapore (1984)
5. Appelquist, T., Chodos, A., Freund, P.G.O.: Modern Kaluza-Klein Theories. Addison–Wesley, Menlo Park (1987)