Bear, H. S. (1962). Differential equations. Addison-Wesley Pub. Co.
Cita Chicago (17th ed.)Bear, Herbert Stanley. Differential Equations. Reading, Mass: Addison-Wesley Pub. Co, 1962.
Cita MLA (9th ed.)Bear, Herbert Stanley. Differential Equations. Addison-Wesley Pub. Co, 1962.
Atenció: Aquestes cites poden no estar 100% correctes.