APA (7e ed.) Bronvermelding

NOWLAN, R. A., & WASHBURN, R. M. (1975). Geometry for teachers. Harper and row.

Chicago (17e ed.) Bronvermelding

NOWLAN, Robert A., en Robert M. WASHBURN. Geometry for Teachers. New York: Harper and row, 1975.

MLA (9e ed.) Bronvermelding

NOWLAN, Robert A., en Robert M. WASHBURN. Geometry for Teachers. Harper and row, 1975.