APA (7th ed.) Citation

Ballmann, W., Gromov, M., & Schroeder, V. (1985). Manifolds of nonpositive curvature (1. print.). Birkhäuser.

Chicago Style (17th ed.) Citation

Ballmann, Werner, Michael Gromov, and Viktor Schroeder. Manifolds of Nonpositive Curvature. 1. print. Boston, Mass. [u.a.]: Birkhäuser, 1985.

MLA (9th ed.) Citation

Ballmann, Werner, et al. Manifolds of Nonpositive Curvature. 1. print. Birkhäuser, 1985.