Barnett, R. A. a. K., & Thomas J. Kerns. (1990). Elementary Algebra: Structure and Use (5th ed.). McGraw-Hill.

Barnett, Raymond A. and Kerns, and Thomas J. Kerns. Elementary Algebra: Structure and Use. 5th ed. New York, USA: McGraw-Hill, 1990.

Barnett, Raymond A. and Kerns, and Thomas J. Kerns. Elementary Algebra: Structure and Use. 5th ed. McGraw-Hill, 1990.