APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Friedrichs, Kurt O. Spectral Theory of Operators in Hilbert Space. New York, NY: New York, NY, 1961.

MLA (9th ed.) Citation

Friedrichs, Kurt O. Spectral Theory of Operators in Hilbert Space. New York, NY, 1961.

Warning: These citations may not always be 100% accurate.