Cita APA (7a ed.)

Zill, D. G., & Cullen, M. R. (1997). Differential equations with boundary-value problems (4th ed.). Brooks-Cole.

Cita Chicago Style (17a ed.)

Zill, Dennis G., y Michael R. Cullen. Differential Equations with Boundary-value Problems. 4th ed. Pacific Grove [California]: Brooks-Cole, 1997.

Cita MLA (9a ed.)

Zill, Dennis G., y Michael R. Cullen. Differential Equations with Boundary-value Problems. 4th ed. Brooks-Cole, 1997.