APA (7th ed.) Citation

Gersten, S. M., & Stallings, J. R. (1987). Combinatorial group theory and topology. Princeton University Press.

Chicago Style (17th ed.) Citation

Gersten, S. M., and John R. Stallings. Combinatorial Group Theory and Topology. Princeton, N.J.: Princeton University Press, 1987.

MLA (9th ed.) Citation

Gersten, S. M., and John R. Stallings. Combinatorial Group Theory and Topology. Princeton University Press, 1987.