JOHNSON, L. M. (1994). Elementary algebra. Harper Collins College Publishers.
Cita Chicago (17th ed.)JOHNSON, L. Murphy. Elementary Algebra. Harper Collins College Publishers, 1994.
Cita MLA (9th ed.)JOHNSON, L. Murphy. Elementary Algebra. Harper Collins College Publishers, 1994.
Atenció: Aquestes cites poden no estar 100% correctes.