Cita APA (7th ed.)

Ringel, G. (1974). Map color theorem. Springer-Verlag.

Cita Chicago (17th ed.)

Ringel, G. Map Color Theorem. Berlin: Springer-Verlag, 1974.

Cita MLA (9th ed.)

Ringel, G. Map Color Theorem. Springer-Verlag, 1974.