Cita APA (7th ed.)

Ahmad, S., & Keener, M. (1980). Differential equations. Academic Press.

Cita Chicago (17th ed.)

Ahmad, Shair, i Marvin Keener. Differential Equations. Nueva York: Academic Press, 1980.

Cita MLA (9th ed.)

Ahmad, Shair, i Marvin Keener. Differential Equations. Academic Press, 1980.