Cita APA (7th ed.)

Hughes, D. R., & Piper, F. C. (1973). Projective planes. Springer-Verlag.

Cita Chicago (17th ed.)

Hughes, D. R., i F. C. Piper. Projective Planes. Nueva York: Springer-Verlag, 1973.

Cita MLA (9th ed.)

Hughes, D. R., i F. C. Piper. Projective Planes. Springer-Verlag, 1973.