1. N. Bourbaki, Algèbre, Hermann, Paris, 1942.
2. C. Chevalley, Fundamental Concepts of Algebra, Stechert-Hafner, New York, 1956.
3. P. R. Halmos, Finite-dimensional Vector Spaces, Van Nostrand, Princeton, N. J., 1958.
4. H. Cartan and S. Eilenberg, Homological Algebra, Princeton University Press, 1956.