References Further Reading
Paul W. Berg and James L. McGregor, Elementary Partial Differential Equations, Holden-Day, San Francisco, CA, 1966.
William E. Boyce and Richard C. DiPrima, Elementary Differential Equations and Boundary Value Problems, 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 Modeling, 5th edition, Pearson, 2014.
Stanley J. Farlow, An Introduction to Differential Equations and Their Applications, McGraw-Hill, Inc., Princeton, NJ, 1994. (Published also by Dover Publications, 2006.)
E.L. Ince, Ordinary Differential Equations, 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/9.