Duncan, D. C. (1969). Arithmetic in a liberal education. McGraw-Hill Book Co., Inc.
芝加哥风格引文Duncan, Dewey C. Arithmetic in a Liberal Education. New York: McGraw-Hill Book Co., Inc, 1969.
MLA引文Duncan, Dewey C. Arithmetic in a Liberal Education. McGraw-Hill Book Co., Inc, 1969.
警告：这些引文格式不一定是100％准确.