APA (7th ed.) Citation

Helmberg, G. (1975). Introduction to spectral theory in Hilbert space (2.pr.). North-Holland Publ.Co.

Chicago Style (17th ed.) Citation

Helmberg, Gilbert. Introduction to Spectral Theory in Hilbert Space. 2.pr. Amsterdam: North-Holland Publ.Co, 1975.

MLA (9th ed.) Citation

Helmberg, Gilbert. Introduction to Spectral Theory in Hilbert Space. 2.pr. North-Holland Publ.Co, 1975.

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