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[BM] Paul W. Berg and James L. McGregor, Elementary Partial Differential Equations, Holden-Day, San Francisco, CA, 1966.

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

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

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

[I] E.L. Ince, Ordinary Differential Equations, Dover Publications, Inc., New York, NY, 1956.

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