Cita APA (7a ed.)

Powers, D. L. (1979). Boundary value problems (2a. ed.). Academic.

Cita Chicago Style (17a ed.)

Powers, David L. Boundary Value Problems. 2a. ed. Nueva York: Academic, 1979.

Cita MLA (9a ed.)

Powers, David L. Boundary Value Problems. 2a. ed. Academic, 1979.