Cita APA (7th ed.)

School Mathematics Study Group & Schaaf, W. L. (1967). Nature and history of Pi. Leland Stanford Junior University.

Cita Chicago (17th ed.)

School Mathematics Study Group i William L. Schaaf. Nature and History of Pi. Stanford, CA: Leland Stanford Junior University, 1967.

Cita MLA (9th ed.)

School Mathematics Study Group i William L. Schaaf. Nature and History of Pi. Leland Stanford Junior University, 1967.