APA (7th ed.) Citation

Hartung, M. L., Eugen, H. V., & Knowles, L. (1961). Seeing through arithmetic: Special book B. Scott.

Chicago Style (17th ed.) Citation

Hartung, Maurice Leslie, H. V. Eugen, and L. Knowles. Seeing Through Arithmetic: Special Book B. Chicago: Scott, 1961.

MLA (9th ed.) Citation

Hartung, Maurice Leslie, et al. Seeing Through Arithmetic: Special Book B. Scott, 1961.