Coddington, E. A., & Levinson, N. (1955). Theory of ordinary differential equations. Tata McGraw-Hill.

Coddington, Earl A., and Norman Levinson. Theory of Ordinary Differential Equations. Bombay: Tata McGraw-Hill, 1955.

Coddington, Earl A., and Norman Levinson. Theory of Ordinary Differential Equations. Tata McGraw-Hill, 1955.