1. L. Auslander and R. MacKenzie, Introduction to Differentiable Manifolds, McGraw-Hill, 1963.
2. P. Hirzebruch, Topological Methods in Algebraic Geometry, 3rd Edition, Springer-Verlag, 1966.
3. P. Halmos, Finite-dimensional vector spaces, 2nd Edition, Van Nostrand, 1958
4. S. Hu, Elements of General Topology, Holden-Day, 1964.
5. J. Milnor, Lectures on characteristic classes, Mimeographed notes, Princeton University, 1957.