Kells, L. M. (1965). Elementary differential equations (Ed.6.). Mc Graw - Hill.
Chicago Edition CitationKells, Lyman M. Elementary Differential Equations. Ed.6. New Delhi: Mc Graw - Hill, 1965.
Cita MLAKells, Lyman M. Elementary Differential Equations. Ed.6. Mc Graw - Hill, 1965.
Atenció: Aquestes cites poden no estar 100% correctes.