King, A. C., Billingham, J., & Otto, S. R. (2003). Differential equations: Linear, nonlinear, ordinary, partial. Cambridge University Press.

King, A. C., J. Billingham, and S. R. Otto. Differential Equations: Linear, Nonlinear, Ordinary, Partial. Cambridge ; New York: Cambridge University Press, 2003.

King, A. C., et al. Differential Equations: Linear, Nonlinear, Ordinary, Partial. Cambridge University Press, 2003.