Swokowski, E. W. (2019). Precalculus: Functions & graphs (13th edition.). Cengage.
芝加哥风格引文Swokowski, Earl W. Precalculus: Functions & Graphs. 13th edition. Boston, MA: Cengage, 2019.
MLA引文Swokowski, Earl W. Precalculus: Functions & Graphs. 13th edition. Cengage, 2019.
警告：这些引文格式不一定是100％准确.