Παραπομπή APA

Duff, G. F. D. (1956). Partial differential equations. University of Toronto Press.

Παραπομπή Chicago Style

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

Παραπομπή MLA

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