1. Baumert, L. D.,Cyclic Difference Sets, Springer-Verlag, Berlin, 1971.
2. Dembowski, P.,Finite Geometries, Springer-Verlag, New York, 1968.
3. Dickson, L. E.,Linear Groups, Dover Publications, Inc., New York, 1958.
4. Hall, M., Jr,The Theory of Groups, Macmillan, New York, 1959.
5. Herstein, I. N.,Topics in Algebra, Wiley, New York, 1975.