Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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