Cita APA (7th ed.)

Beckmann, P. (1971). A history of Pi. St. Martin's Press.

Cita Chicago (17th ed.)

Beckmann, Petr. A History of Pi. Nueva York: St. Martin's Press, 1971.

Cita MLA (9th ed.)

Beckmann, Petr. A History of Pi. St. Martin's Press, 1971.