Παραπομπή APA

Gilbarg, D., & Trudinger, N. S. (1977). Elliptic partial differential equations of second order. Springer-Verlag.

Παραπομπή Chicago Style

Gilbarg, David, και Neil S. Trudinger. Elliptic Partial Differential Equations of Second Order. Berlin ; New York: Springer-Verlag, 1977.

Παραπομπή MLA

Gilbarg, David, και Neil S. Trudinger. Elliptic Partial Differential Equations of Second Order. Springer-Verlag, 1977.