APA (7th ed.) Citation

Cohen, G. L., & Shannon, A. G. (1981). John Ward's method for the calculation of pi.

Chicago Style (17th ed.) Citation

Cohen, G. L., and A. G. Shannon. John Ward's Method for the Calculation of Pi. 1981.

MLA (9th ed.) Citation

Cohen, G. L., and A. G. Shannon. John Ward's Method for the Calculation of Pi. 1981.

Warning: These citations may not always be 100% accurate.