1. Eisenhart, L.P. (1949). Riemannian Geometry, Princeton University Press.
2. Eisenhart, L.P. (1927). Non-Riemannian Geometry, American Mathematical Society.
3. Mikeš, J., Stepanova, E., Vanžurová, A., Bácsó, S., Berezovski, V.E., Chepurna, O., Chodorová, M., Chudá, H., Gavrilchenko, M.L., and Haddad, M. (2019). Differential Geometry of Special Mappings, Palacký University Press. [2nd ed.].
4. On Almost Geodesic Mappings π2(e) onto Riemannian Spaces;Pokorna;Rend. Circ. Mat. Palermo,2004
5. Sinyukov, N.S. (1979). Geodesic Mappings of Riemannian Spaces, Nauka.