Ayres, F. (1972). Theory and Problems of Differential Equations. McGraw Hill.
Cita Chicago (17th ed.)Ayres, Frank. Theory and Problems of Differential Equations. McGraw Hill, 1972.
Cita MLA (9th ed.)Ayres, Frank. Theory and Problems of Differential Equations. McGraw Hill, 1972.
Atenció: Aquestes cites poden no estar 100% correctes.