1. ATLAS of Finite Groups;Conway,1985
2. Endliche Gruppen I;Huppert,1979
3. O. H. Kegel, 1967, On Huppert's characterization of finite supersoluble groups, Proc. Internat. Conf. Theory of Groups, Canberra, 1965, 209, 215, Gordon and Breach, New York
4. The Subgroup Structure of the Classical Groups;Kleidman,1990
5. Subnormal Subgroups of Groups;Lennox,1987