APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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