DUTTON, W. H., PETRIE, C. C., & ADAMS, L. (1970). Arithmetic for teachers.-- Ed. 2. Prentice-Hall.
Cita Chicago (17th ed.)DUTTON, Wilbur H., Colin C. PETRIE, i L.J ADAMS. Arithmetic for Teachers.-- Ed. 2. New Jersey: Prentice-Hall, 1970.
Cita MLA (9th ed.)DUTTON, Wilbur H., et al. Arithmetic for Teachers.-- Ed. 2. Prentice-Hall, 1970.
Atenció: Aquestes cites poden no estar 100% correctes.