Cita APA (7a ed.)

Kells, L. M. 1. (1965). Elementary differential equations (6a. ed.). McGraw-Hill.

Cita Chicago Style (17a ed.)

Kells, Lyman Morse 1888. Elementary Differential Equations. 6a. ed. New York: McGraw-Hill, 1965.

Cita MLA (9a ed.)

Kells, Lyman Morse 1888. Elementary Differential Equations. 6a. ed. McGraw-Hill, 1965.