APA-referens (7:e uppl.)

Duncan, D. C. (1969). Arithmetic in a liberal education. McGraw-Hill Book Co., Inc.

Chicago-referens (17:e uppl.)

Duncan, Dewey C. Arithmetic in a Liberal Education. New York: McGraw-Hill Book Co., Inc, 1969.

MLA-referens (9:e uppl.)

Duncan, Dewey C. Arithmetic in a Liberal Education. McGraw-Hill Book Co., Inc, 1969.