Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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