APA
Lorch E., . (1962). Spectral theory. New York: Oxford University Press.
Chicago
Lorch Edgar, . 1962. Spectral theory. New York: Oxford University Press.
Harvard
Lorch E., . (1962). Spectral theory. New York: Oxford University Press.
MLA
Lorch Edgar, . Spectral theory. New York: Oxford University Press. 1962.