JOHNSON, R. E., FOERSTER, P. A., & JOHNSON, C. G. (1977). Algebra: The language of mathematics book 2. Addison-wesley.

JOHNSON, Richard E., Paul A. FOERSTER, and Cheryl G. JOHNSON. Algebra: The Language of Mathematics Book 2. California: Addison-wesley, 1977.

JOHNSON, Richard E., et al. Algebra: The Language of Mathematics Book 2. Addison-wesley, 1977.