Harris, H. H. (1959). The history and calculation of pi. Graduate Division of the Kansas State Teachers College.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHarris, Herman H. The History and Calculation of Pi. Emporia: Graduate Division of the Kansas State Teachers College, 1959.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHarris, Herman H. The History and Calculation of Pi. Graduate Division of the Kansas State Teachers College, 1959.
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