1. Lectures on injective modules and quotient rings;Faith,1967
2. Algebra: Rings, Modules and Categories I;Faith,1973
3. The theory of rings;Jacobson,1942
4. Quotient rings of rings with zero singular ideal;Johnson;Pacific J. Math.,1961
5. Rings with zero right and left singular ideals;Johnson;Trans. Amer. Math. Soc.,1965