APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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