APA Edition Citation

Helmberg,Gilbert. (1969). Introduction to Spectral Theory in Hilbert Space (1969.). North-Holland Publishing Company.

Chicago Edition Citation

Helmberg,Gilbert. Introduction to Spectral Theory in Hilbert Space. 1969. London: North-Holland Publishing Company, 1969.

MLA Edition Citation

Helmberg,Gilbert. Introduction to Spectral Theory in Hilbert Space. 1969. North-Holland Publishing Company, 1969.

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