Cita APA (7a ed.)

Ballmann, W. (1995). Lectures on spaces of nonpositive curvature (1ra. ed.). Birkhäuser.

Cita Chicago Style (17a ed.)

Ballmann, Werner. Lectures on Spaces of Nonpositive Curvature. 1ra. ed. Basel: Birkhäuser, 1995.

Cita MLA (8a ed.)

Ballmann, Werner. Lectures on Spaces of Nonpositive Curvature. 1ra. ed. Birkhäuser, 1995.