Citazione Stile APA (7a Edizione)

Friedrichs, K. O. (1973). Spectral theory of operators in Hilbert space. Springer-Verlag.

Citazione stile Chigago Style (17a edizione)

Friedrichs, K. O. Spectral Theory of Operators in Hilbert Space. Nueva York: Springer-Verlag, 1973.

Citatione MLA (9a ed.)

Friedrichs, K. O. Spectral Theory of Operators in Hilbert Space. Springer-Verlag, 1973.