Birkhoff, G., & Rota, G. (1989). Introduction to ordinary differential equations (4th ed.). Wiley.
Cita Chicago (17th ed.)Birkhoff, Garrett, i Gian-Carlo Rota. Introduction to Ordinary Differential Equations. 4th ed. New York: Wiley, 1989.
Cita MLA (9th ed.)Birkhoff, Garrett, i Gian-Carlo Rota. Introduction to Ordinary Differential Equations. 4th ed. Wiley, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.