Chapter 31
Basic Training in Mathematics. By R. Shankar. Plenum Press. NY. 1995

31.1 Chapter 10, Differential equations. Section 10.2, ODEs with constant Coefficients. page 307
31.2 Chapter 10, Differential equations. Section 10.3, ODEs with variable Coefficients. First order. page 315
31.3 Chapter 10, Differential equations. Section 10.4, ODEs with variable Coefficients. Second order and Homogeneous. page 318