APA (7th ed.) Citation

Ballmann, W. (1985). Manifolds of Nonpositive Curvature. Birkhäuser Boston. https://doi.org/10.1007/978-1-4684-9159-3

Chicago Style (17th ed.) Citation

Ballmann, Werner. Manifolds of Nonpositive Curvature. Boston, MA: Birkhäuser Boston, 1985. https://doi.org/10.1007/978-1-4684-9159-3.

MLA (9th ed.) Citation

Ballmann, Werner. Manifolds of Nonpositive Curvature. Birkhäuser Boston, 1985. https://doi.org/10.1007/978-1-4684-9159-3.