APA (7th ed.) Citation

Bernfeld, S. R., & Lakshmikantham, V. (1974). A introduction to nonlinear boundary value problems. Acad. Pr.

Chicago Style (17th ed.) Citation

Bernfeld, Stephen R., and Vangipuram Lakshmikantham. A Introduction to Nonlinear Boundary Value Problems. New York [u.a.]: Acad. Pr, 1974.

MLA (9th ed.) Citation

Bernfeld, Stephen R., and Vangipuram Lakshmikantham. A Introduction to Nonlinear Boundary Value Problems. Acad. Pr, 1974.