Markley, N. G. (2004). Principles of differential equations. John Wiley.
Cita Chicago (17th ed.)Markley, Nelson G. Principles of Differential Equations. Hoboken, NJ: John Wiley, 2004.
Cita MLA (8th ed.)Markley, Nelson G. Principles of Differential Equations. John Wiley, 2004.
Atenció: Aquestes cites poden no estar 100% correctes.