Hungerford, T. W. (2004). Contemporary precalculus. Thomson-Brooks/Cole.
Cita Chicago (17th ed.)Hungerford, Thomas W. Contemporary Precalculus. Belmont, CA: Thomson-Brooks/Cole, 2004.
Cita MLA (9th ed.)Hungerford, Thomas W. Contemporary Precalculus. Thomson-Brooks/Cole, 2004.
Atenció: Aquestes cites poden no estar 100% correctes.