APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Helmberg, Gilbert. Introduction to Spectral Theory in Hilbert Space. 2. print. Amsterdam [u.a.]: North-Holland Publ. Co, 1975.

MLA (9th ed.) Citation

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