Ayres, F. J. (1952). Theory and Problems of Differential Equations. McGraw-Hill.
Cita Chicago (17th ed.)Ayres, Frank Jr. Theory and Problems of Differential Equations. New York: McGraw-Hill, 1952.
Cita MLA (9th ed.)Ayres, Frank Jr. Theory and Problems of Differential Equations. McGraw-Hill, 1952.
Atenció: Aquestes cites poden no estar 100% correctes.