Citazione APA

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

Stile di citazione Chicago

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

Citazione MLA

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