Introduction to Differential Equations

Paul W. Berg and James L. McGregor, Elementary Partial Differential Equations¹, Holden-Day, San Francisco, CA, 1966.

William E. Boyce and Richard C. DiPrima, Elementary Differential Equations and Boundary Value Problems², 11th edition, John Wiley & Sons Inc., New York, NY, 2017.

C.H. Edwards and D.E. Penney, Differential Equations and Boundary Value Problems: Computing and Modeling³, 5th edition, Pearson, 2014.

Stanley J. Farlow, An Introduction to Differential Equations and Their Applications⁴, McGraw-Hill, Inc., Princeton, NJ, 1994. (Published also by Dover Publications, 2006.)

E.L. Ince, Ordinary Differential Equations⁵, Dover Publications, Inc., New York, NY, 1956.

William F. Trench, Elementary Differential Equations with Boundary Value Problems, Books and Monographs, Book 9, 2013, https://digitalcommons.trinity.edu/mono/9⁶.