Cita APA (7a ed.)

Duff, G. F. D. (1956). Partial Differential Equations. University of Toronto Press.

Cita Chicago Style (17a ed.)

Duff, G. F. D. Partial Differential Equations. Toronto: University of Toronto Press, 1956.

Cita MLA (8a ed.)

Duff, G. F. D. Partial Differential Equations. University of Toronto Press, 1956.