APA (7th ed.) Citation

Ballmann, W., Gromov, M., & Schroeder, V. (1985). Manifolds of nonpositive curvature. Birkhäuser.

Chicago Style (17th ed.) Citation

Ballmann, Werner, Mikhael Gromov, and Viktor Schroeder. Manifolds of Nonpositive Curvature. Boston: Birkhäuser, 1985.

MLA (9th ed.) Citation

Ballmann, Werner, et al. Manifolds of Nonpositive Curvature. Birkhäuser, 1985.