APA (7th ed.) Citation

Hassler, J. O., Smith, R. R., & Hedrick, E. R. (1940). The teaching of secondary mathematics. The Macmillan company.

Chicago Style (17th ed.) Citation

Hassler, Jasper Ole, Rolland Ryther Smith, and Earle Raymond Hedrick. The Teaching of Secondary Mathematics. New York: The Macmillan company, 1940.

MLA (9th ed.) Citation

Hassler, Jasper Ole, et al. The Teaching of Secondary Mathematics. The Macmillan company, 1940.