APA

Duff G. F. D., . (1966). Differential equations of applied mathematics. New York: Wiley.

Chicago

Duff G F D, . 1966. Differential equations of applied mathematics. New York: Wiley.

Harvard

Duff G. F. D., . (1966). Differential equations of applied mathematics. New York: Wiley.

MLA

Duff G F D, . Differential equations of applied mathematics. New York: Wiley. 1966.