Cita APA

Beckmann, P. (1990). A history of PI. New York: Barnes & Noble Books.

Chicago Style Citation

Beckmann, Petr. A History of PI. New York: Barnes & Noble Books, 1990.

Cita MLA

Beckmann, Petr. A History of PI. New York: Barnes & Noble Books, 1990.

Atenció: Aquestes cites poden no estar 100% correctes.