Citazione Stile APA (7a Edizione)

Kelly, P. J., & Matthews, G. (1981). The non-euclidean, hyperbolic plane: Its structure and consistency. Springer-Verlag.

Citazione stile Chigago Style (17a edizione)

Kelly, Paul J., e Gordon Matthews. The Non-euclidean, Hyperbolic Plane: Its Structure and Consistency. Nueva York: Springer-Verlag, 1981.

Citatione MLA (9a ed.)

Kelly, Paul J., e Gordon Matthews. The Non-euclidean, Hyperbolic Plane: Its Structure and Consistency. Springer-Verlag, 1981.