Spiegel, M. R., & Moyer, R. E. (2009). Pre-Calculus (2nd ed.). McGraw-Hill.
Cita Chicago (17th ed.)Spiegel, Murray R., i Robert E. Moyer. Pre-Calculus. 2nd ed. New York: McGraw-Hill, 2009.
Cita MLA (9th ed.)Spiegel, Murray R., i Robert E. Moyer. Pre-Calculus. 2nd ed. McGraw-Hill, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.