Forsyth, A. R. (1929). A treatise on differential equations (6a. ed.). Macmillan.
Cita Chicago (17th ed.)Forsyth, Andrew Russell. A Treatise on Differential Equations. 6a. ed. Londres: Macmillan, 1929.
Cita MLA (9th ed.)Forsyth, Andrew Russell. A Treatise on Differential Equations. 6a. ed. Macmillan, 1929.
Atenció: Aquestes cites poden no estar 100% correctes.