Willoughby, S. S. (1991). Real math. Open Court.
芝加哥风格引文Willoughby, Stephen S. Real Math. La Salle: Open Court, 1991.
MLA引文Willoughby, Stephen S. Real Math. Open Court, 1991.
警告：这些引文格式不一定是100％准确.
APA引文
Willoughby, S. S. (1991). Real math. Open Court.
芝加哥风格引文Willoughby, Stephen S. Real Math. La Salle: Open Court, 1991.
MLA引文Willoughby, Stephen S. Real Math. Open Court, 1991.