Cita APA

Helmberg, G., & Helmberg, G. (1975). Introduction to spectral theory in Hilbert space. Amsterdam: North Holland.

Citación estilo Chicago

Helmberg, Gilbert, y Gilbert Helmberg. Introduction to Spectral Theory in Hilbert Space. Amsterdam: North Holland, 1975.

Cita MLA

Helmberg, Gilbert, y Gilbert Helmberg. Introduction to Spectral Theory in Hilbert Space. Amsterdam: North Holland, 1975.