Cita APA (7th ed.)

Powers, D. L. (1987). Boundary value problems (3a. ed.). Harcourt Brace Jovanovich.

Cita Chicago (17th ed.)

Powers, David L. Boundary Value Problems. 3a. ed. San Diego: Harcourt Brace Jovanovich, 1987.

Cita MLA (9th ed.)

Powers, David L. Boundary Value Problems. 3a. ed. Harcourt Brace Jovanovich, 1987.