APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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

Kontuz: berrikusi erreferentzia hauek erabili aurretik.