Παραπομπή APA

Titehmarsh, E. (1970). Eigenfunction expansions associated with second order differential equations. Clarendon.

Παραπομπή Chicago Style

Titehmarsh, E.C. Eigenfunction Expansions Associated with Second Order Differential Equations. Oxford: Clarendon, 1970.

Παραπομπή MLA

Titehmarsh, E.C. Eigenfunction Expansions Associated with Second Order Differential Equations. Clarendon, 1970.