APA (7th ed.) Citation

Butler, C. H., & Wren, F. L. (1941). The teaching of secondary mathematics. McGraw-Hill Book Company.

Chicago Style (17th ed.) Citation

Butler, Charles H., and F. Lynwood Wren. The Teaching of Secondary Mathematics. McGraw-Hill Book Company, 1941.

MLA (8th ed.) Citation

Butler, Charles H., and F. Lynwood Wren. The Teaching of Secondary Mathematics. McGraw-Hill Book Company, 1941.

Warning: These citations may not always be 100% accurate.