Παραπομπή APA

Showalter, R. E. (1979). Hilbert space methods for partial differential equations.

Παραπομπή Chicago Style

Showalter, R E. Hilbert Space Methods for Partial Differential Equations. Pitman Advanced Publishing Program, San Francisco, 1979.

Παραπομπή MLA

Showalter, R E. Hilbert Space Methods for Partial Differential Equations. 1979.