APA (7th ed.) Citation

Helson, H. (1964). Lectures on invariant subspaces. Academic Press.

Chicago Style (17th ed.) Citation

Helson, Henry. Lectures on Invariant Subspaces. New York: Academic Press, 1964.

MLA (8th ed.) Citation

Helson, Henry. Lectures on Invariant Subspaces. Academic Press, 1964.

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