Cita APA (7a ed.)
Gaal, S. A. (1964). Point set Topology. Academic Press.
Cita Chicago Style (17a ed.)
Gaal, Steven A. Point Set Topology. New York: Academic Press, 1964.
Cita MLA (9a ed.)
Gaal, Steven A. Point Set Topology. Academic Press, 1964.
Precaución: Estas citas no son 100% exactas.