Spiegel, M. R. (1981). Applied differential equations (3d ed.). Prentice-Hall.
Cita Chicago (17th ed.)Spiegel, Murray R. Applied Differential Equations. 3d ed. Englewood Cliffs, N.J: Prentice-Hall, 1981.
Cita MLA (9th ed.)Spiegel, Murray R. Applied Differential Equations. 3d ed. Prentice-Hall, 1981.
Atenció: Aquestes cites poden no estar 100% correctes.