APA-referens (7:e uppl.)

Coleman, R. (1972). The development of informal geometry. AMS Press.

Chicago-referens (17:e uppl.)

Coleman, Robert. The Development of Informal Geometry. [New York: AMS Press, 1972.

MLA-referens (8:e uppl.)

Coleman, Robert. The Development of Informal Geometry. AMS Press, 1972.