Cita APA (7th ed.)

Marks, J. L., Purdy, C. R., & Kinney, L. B. (1970). Teaching elementary school mathematics for understanding. McGraw-Hill.

Cita Chicago (17th ed.)

Marks, John L., C. R. Purdy, i L. B. Kinney. Teaching Elementary School Mathematics for Understanding. New York: McGraw-Hill, 1970.

Cita MLA (9th ed.)

Marks, John L., et al. Teaching Elementary School Mathematics for Understanding. McGraw-Hill, 1970.