DUFF, G. (1967). Partial differential equations. University of Toronto Press.
Citazione stile Chigago Style (17a edizione)DUFF, G.F.D. Partial Differential Equations. Toronto: University of Toronto Press, 1967.
Citatione MLA (9a ed.)DUFF, G.F.D. Partial Differential Equations. University of Toronto Press, 1967.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.