Παραπομπή APA

Keen, L., & Lakic, N. (2007). Hyperbolic geometry from a local viewpoint. Cambridge University.

Παραπομπή Chicago Style

Keen, Linda, και Nikola Lakic. Hyperbolic Geometry from a Local Viewpoint. Cambridge: Cambridge University, 2007.

Παραπομπή MLA

Keen, Linda, και Nikola Lakic. Hyperbolic Geometry from a Local Viewpoint. Cambridge University, 2007.