Cita APA (7th ed.)

Friedrichs, K. O. (1961). Spectral theory of operators in Hilbert Space. New York University.

Cita Chicago (17th ed.)

Friedrichs, K. O. Spectral Theory of Operators in Hilbert Space. Nueva York: New York University, 1961.

Cita MLA (9th ed.)

Friedrichs, K. O. Spectral Theory of Operators in Hilbert Space. New York University, 1961.