APA-viite

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

Chicago-tyylinen lähdeviittaus

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

MLA-viite

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