APA استشهاد

Kells, L. M. (1965). Elementary differential equations (Ed.6.). Mc Graw - Hill.

استشهاد بنمط شيكاغو

Kells, Lyman M. Elementary Differential Equations. Ed.6. New Delhi: Mc Graw - Hill, 1965.

MLA استشهاد

Kells, Lyman M. Elementary Differential Equations. Ed.6. Mc Graw - Hill, 1965.