1. F. W. Anderson and K. R. Fuller, Rings and Categories of Modules, Springer, New York,1974.
2. H. Bass, Finistic dimension and a homological generalization of semiprimary rings, Trans. Amer. Math. Soc., 95(3) (1960), 466–488.
3. J. Clark, On max modules, Proceedings of the 32nd Symposium on Ring Theory and Representation Theory (Yamaguchi, 1999), 23-32, Tokyo Univ. Agric. Technol., Tokyo,2000.
4. N. V. Dung, D. V. Huynh, R F. Smith and R. Wisbauer, Extending Modules, Pitman Research Notes 313, Longman, 1994.
5. C. Faith, Rings whose modules have maximal submodules, Puhl. Mat., 39(1) (1995), 201–214.