APA (7th ed.) Citation

Helmberg, G. (1997). Introduction to spectral theory in Hilbert space. Dover Publications.

Chicago Style (17th ed.) Citation

Helmberg, Gilbert. Introduction to Spectral Theory in Hilbert Space. Mineola, NY: Dover Publications, 1997.

MLA (9th ed.) Citation

Helmberg, Gilbert. Introduction to Spectral Theory in Hilbert Space. Dover Publications, 1997.

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