Math 135: Ordinary Differential Equations

Textbook:
G. Simmons, Differential Equations with Applications and Historical Notes, 2nd Ed., McGraw-Hill.

I also use material from other resources
Reference:
G. Carrier & C. Pearson, Ordinary Differential Equations, Siam.
E. Coddington & R. Carlson, Linear Ordinary Differential Equations, Siam