Cohen, H. (2011). Numerical approximation methods: π ≈ 355/113. Springer.
芝加哥风格引文Cohen, Harold. Numerical Approximation Methods: π ≈ 355/113. New York: Springer, 2011.
MLA引文Cohen, Harold. Numerical Approximation Methods: π ≈ 355/113. Springer, 2011.
警告：这些引文格式不一定是100％准确.