APA (7th ed.) Citation

Halmos, P. R. (1951). Introduction to Hilbert space and the theory of spectral multiplicity. Chelsea Publ. Co.

Chicago Style (17th ed.) Citation

Halmos, Paul R. Introduction to Hilbert Space and the Theory of Spectral Multiplicity. New York: Chelsea Publ. Co, 1951.

MLA (9th ed.) Citation

Halmos, Paul R. Introduction to Hilbert Space and the Theory of Spectral Multiplicity. Chelsea Publ. Co, 1951.

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