Cita APA (7th ed.)

Kells, L. M. (1965). Elementary differential equations (6th ed.). McGraw-Hill Book Co., Inc.

Cita Chicago (17th ed.)

Kells, Lyman Morse. Elementary Differential Equations. 6th ed. New York: McGraw-Hill Book Co., Inc, 1965.

Cita MLA (9th ed.)

Kells, Lyman Morse. Elementary Differential Equations. 6th ed. McGraw-Hill Book Co., Inc, 1965.