A friend of mine gifted me his copy of Spivak's Calculus on Manifolds. I was looking out for a good book to relearn MV Calculus to the extent of :
Multivariable Limits, Continuity and Differentiation Differential Calculus of Vector and Scalar Fields Multiple/Surface Integrals
My intention was to go through a nice rigorous text to prepare me for my research in Numerical Optimization.