APA (7th ed.) Citation

Gaal, S. A. (1964). Point set topology. Academic Press.

Chicago Style (17th ed.) Citation

Gaal, Steven A. Point Set Topology. New York: Academic Press, 1964.

MLA (8th ed.) Citation

Gaal, Steven A. Point Set Topology. Academic Press, 1964.

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