1. Zill, D. G. and Cullen, M. R. 1997.Differential Equations with Boundary-value Problems, 176–192. New York: Brooks Cole Publishing Company. chapter 5
2. Greenberg, M. D. 2001.Differential Equations and Linear Algebra, 344–351. Engelwood Cliffs, NJ: Prentice Hall. chapter 7
3. Nagle, R. K. and Saff, E. B. 1986.Fundamentals of Differential Equations, 284–305. The Benjamin/Cummings Publishing Company. chapter 6
4. Spectral Galerkin methods for the primary two-point boundary value problem in modelling viscoelastic flows
5. Khan, M. S. 1994. “Finite-difference solutions of fifth-order boundary-value problems”. 19–20. Brunel University. chapter 1