DERRICK, W. R. (1976). Elementary differential equations with: Applications. Addison-Wesley.
Cita Chicago (17th ed.)DERRICK, William R. Elementary Differential Equations with: Applications. Reading, Mass: Addison-Wesley, 1976.
Cita MLA (9th ed.)DERRICK, William R. Elementary Differential Equations with: Applications. Addison-Wesley, 1976.
Atenció: Aquestes cites poden no estar 100% correctes.