1. J.R. Clay, The near rings on a finite cyclic group. Am. Math. Mon. 71(1) (1964)
2. M. Hall, The Theory of Groups, 2nd edn. (AMS Chelsea Publishing, 1999)
3. A. G. Kurosh, Theory of Groups, vol. 1 (Chelsea Publishing Company, 1955)
4. R. Lockhart, The Near-Rings on a Class of Groups. Ph.D. Thesis, Nottingham University (1977)
5. D.J.S. Robinson, A Course in the Theory of Groups, 2nd edn. (Springer, Berlin, 1995)