Cita APA (7a ed.)
Fenchel, W. (1989). Elementary geometry in hyperbolic space. Walter de Gruyter.
Cita Chicago Style (17a ed.)
Fenchel, W. Elementary Geometry in Hyperbolic Space. Berlin ; New York: Walter de Gruyter, 1989.
Cita MLA (9a ed.)
Fenchel, W. Elementary Geometry in Hyperbolic Space. Walter de Gruyter, 1989.
Precaución: Estas citas no son 100% exactas.