APA

Beckmann P., . (1971). A history of [pi] (pi). Boulder, Colo: Golem Press.

Chicago

Beckmann Petr, . 1971. A history of [pi] (pi). Boulder, Colo: Golem Press.

Harvard

Beckmann P., . (1971). A history of [pi] (pi). Boulder, Colo: Golem Press.

MLA

Beckmann Petr, . A history of [pi] (pi). Boulder, Colo: Golem Press. 1971.