APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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