APA (7e ed.) Bronvermelding

Morton, R. L. (1937). Teaching arithmetic in elementary school. Silver Burdett company.

Chicago (17e ed.) Bronvermelding

Morton, Robert Lee. Teaching Arithmetic in Elementary School. New York, boston [etc.]: Silver Burdett company, 1937.

MLA (9e ed.) Bronvermelding

Morton, Robert Lee. Teaching Arithmetic in Elementary School. Silver Burdett company, 1937.