Cita APA (7th ed.)

ESSER, M. (1968). Differential equations. W.B. Saunders.

Cita Chicago (17th ed.)

ESSER, Martinus. Differential Equations. London: W.B. Saunders, 1968.

Cita MLA (9th ed.)

ESSER, Martinus. Differential Equations. W.B. Saunders, 1968.