Benjamin, A. (2006). Secrets of mental math: The mathemagician's guide to lightning calculation. Three rivers.
Citazione stile Chigago Style (17a edizione)Benjamin, Arthur. Secrets of Mental Math: The Mathemagician's Guide to Lightning Calculation. New York: Three rivers, 2006.
Citatione MLA (9a ed.)Benjamin, Arthur. Secrets of Mental Math: The Mathemagician's Guide to Lightning Calculation. Three rivers, 2006.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.