APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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