1. F. W. Anderson and K. R. Fuller, Rings and categories of modules, vol. 13. Springer Science & Business Media, 2012.
2. T. Y. Lam, “A First Course in Non-Commutative Rings Springer-Verlag, New York.” Inc, 1991.
3. T. Y. Lam, “Lectures on modules and rings, Springer-Verlag, New York.” Inc, 1999.
4. B. H. Al-Bahrani and H. S. Al-Redeeni, “Hollow Modules With Respect to an Arbitrary Submodule,” Iraqi J. Sci., vol. 58, no. 2A, pp. 694–698, 2017.
5. M. Harada, “A not on hollow modules,” Rev. la, Union Matemitica Argentina, vol. 28, pp. 186–194, 1978.