Cita APA (7a ed.)

Butler, C. H., & Wren, F. L. (1965). The teaching of secondary mathematics (4th ed.). McGraw-Hill.

Cita Chicago Style (17a ed.)

Butler, Charles Henry, y Frank Lynwood Wren. The Teaching of Secondary Mathematics. 4th ed. New York: McGraw-Hill, 1965.

Cita MLA (9a ed.)

Butler, Charles Henry, y Frank Lynwood Wren. The Teaching of Secondary Mathematics. 4th ed. McGraw-Hill, 1965.