APA (7th ed.) Citation

Bernfeld, S. R., & Lakshmikantham, V. (1974). An introduction to nonlinear boundary value problems. Academic Press.

Chicago Style (17th ed.) Citation

Bernfeld, Stephen R., and V. Lakshmikantham. An Introduction to Nonlinear Boundary Value Problems. New York: Academic Press, 1974.

MLA (9th ed.) Citation

Bernfeld, Stephen R., and V. Lakshmikantham. An Introduction to Nonlinear Boundary Value Problems. Academic Press, 1974.