Cita APA (7th ed.)
Gray, D. (2006). Calculate with confidence (4th ed.). Mosby.
Cita Chicago (17th ed.)
Gray, Deborah. Calculate with Confidence. 4th ed. St. Louis, Mo.: Mosby, 2006.
Cita MLA (9th ed.)
Gray, Deborah. Calculate with Confidence. 4th ed. Mosby, 2006.
Atenció: Aquestes cites poden no estar 100% correctes.