APA (7th ed.) Citation

Choong, K., Daykin, D., & Rathbone, C. (1971). Rational approximations to pie. American Mathematical Society.

Chicago Style (17th ed.) Citation

Choong, K.Y, D.E Daykin, and C.R Rathbone. Rational Approximations to Pie. American Mathematical Society, 1971.

MLA (9th ed.) Citation

Choong, K.Y, et al. Rational Approximations to Pie. American Mathematical Society, 1971.