Cita APA (7th ed.)

Butler, C. H. 1., & Wren, F. L. 1. . . j. a. (1965). The teaching of secondary mathematics (4th ed.). McGraw-Hill.

Cita Chicago (17th ed.)

Butler, Charles Henry 18940-, i Frank Lynwood 1894- joint auth Wren. The Teaching of Secondary Mathematics. 4th ed. New York: McGraw-Hill, 1965.

Cita MLA (9th ed.)

Butler, Charles Henry 18940-, i Frank Lynwood 1894- joint auth Wren. The Teaching of Secondary Mathematics. 4th ed. McGraw-Hill, 1965.