To read the three books below we need the more patient.

F. Maggi, Sets of Finite Perimeter and Geometric Variational Problems --- An Introduction to Geometric Measure Theory , CUP,2012
Qing Han, A Basic Course in Partial Differential Equations, AMS, 2011
A.Gray, Modern Differential Geometry of Curves and Surfaces with Mathematica, CRC, 2006