Παραπομπή APA

Goursat, E. (1964). Variation of solutions: Partial differential equations of the second order.

Παραπομπή Chicago Style

Goursat, Edouard. Variation of Solutions: Partial Differential Equations of the Second Order. Dover Publcations, New York, 1964.

Παραπομπή MLA

Goursat, Edouard. Variation of Solutions: Partial Differential Equations of the Second Order. 1964.