APA (7th ed.) Citation

426028 Maxfield, J. E., & Maxfield, M. W. (1973). Keys to mathematics. Philadelphia, Pa. : W B Saunders.

Chicago Style (17th ed.) Citation

426028 Maxfield, John E., and Margaret W. Maxfield. Keys to Mathematics. Philadelphia, Pa. : W B Saunders, 1973.

MLA (9th ed.) Citation

426028 Maxfield, John E., and Margaret W. Maxfield. Keys to Mathematics. Philadelphia, Pa. : W B Saunders, 1973.