Hart, W. L. R. (1953). College algebra (4th ed.). National Bookstore.
芝加哥风格引文Hart, William Le Roy. College Algebra. 4th ed. Manila: National Bookstore, 1953.
MLA引文Hart, William Le Roy. College Algebra. 4th ed. National Bookstore, 1953.
警告：这些引文格式不一定是100％准确.