Benjamin, A. (2006). Secrets of mental math: The mathemagician's guide to lightning calculation. Three rivers.
Cita Chicago (17th ed.)Benjamin, Arthur. Secrets of Mental Math: The Mathemagician's Guide to Lightning Calculation. New York: Three rivers, 2006.
Cita MLA (9th ed.)Benjamin, Arthur. Secrets of Mental Math: The Mathemagician's Guide to Lightning Calculation. Three rivers, 2006.
Atenció: Aquestes cites poden no estar 100% correctes.