APA (7 ম সংস্করণ) উদ্ধৃতি

Harris, H. H. (1959). The history and calculation of pi. Graduate Division of the Kansas State Teachers College.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

Harris, Herman H. The History and Calculation of Pi. Emporia: Graduate Division of the Kansas State Teachers College, 1959.

M.L.A (8 ম সংস্করণ) উদ্ধৃতি

Harris, Herman H. The History and Calculation of Pi. Graduate Division of the Kansas State Teachers College, 1959.