Cita APA (7a ed.)
Berman, G., & Fryer, K. D. (1972). Introduction to combinatorics. Academic Press.
Cita Chicago Style (17a ed.)
Berman, Gerald, y K. D. Fryer. Introduction to Combinatorics. New York: Academic Press, 1972.
Cita MLA (9a ed.)
Berman, Gerald, y K. D. Fryer. Introduction to Combinatorics. Academic Press, 1972.
Precaución: Estas citas no son 100% exactas.