1. R. S. Millman and G.D. Parker, Elements of Differential Geometry (Prentice-Hall, New Jersey, 1977). 2. A. Goetz, Introduction to Differential Geometry (Addison-Wesley, 1970). 3. E. Kreyzig, Differential Geometry (Dover, 1991). 4. M. M. Lipschutz, Schaum's Outline of Differential Geometry (McGraw Hill, 1969). 5. D. Somasundaram, Differential Geometry (Narosa Publishing House, New Delhi, 2005).
