Lefschetz, S. (1977). Differential equations: Geometric theory (2a. ed.). Dover Publications Inc.
Cita Chicago Style (17a ed.)Lefschetz, Solomon. Differential Equations: Geometric Theory. 2a. ed. Nueva York: Dover Publications Inc, 1977.
Cita MLA (9a ed.)Lefschetz, Solomon. Differential Equations: Geometric Theory. 2a. ed. Dover Publications Inc, 1977.
Precaución: Estas citas no son 100% exactas.