APA (7th ed.) Citation

Penner, R. C., & Harer, J. (1992). Combinatorics of train tracks. Princeton University Press.

Chicago Style (17th ed.) Citation

Penner, R. C., and John Harer. Combinatorics of Train Tracks. Princeton, N.J.: Princeton University Press, 1992.

MLA (9th ed.) Citation

Penner, R. C., and John Harer. Combinatorics of Train Tracks. Princeton University Press, 1992.