Cita APA (7th ed.)

Barreira, L., & Valls, C. (2012). Ordinary differential equations: Qualitative theory. American Mathematical Society.

Cita Chicago (17th ed.)

Barreira, Luis, i Claudia Valls. Ordinary Differential Equations: Qualitative Theory. Providence, USA: American Mathematical Society, 2012.

Cita MLA (9th ed.)

Barreira, Luis, i Claudia Valls. Ordinary Differential Equations: Qualitative Theory. American Mathematical Society, 2012.