CLAWSON, C. C. (2004). The mathematical traveler: Exploring the grand history of numbers. Viva Books Private Limited.
Lua i Stíl Chicago (17ú heag.)CLAWSON, Calvin C. The Mathematical Traveler: Exploring the Grand History of Numbers. New Delhi: Viva Books Private Limited, 2004.
Lua MLA (9ú heag.)CLAWSON, Calvin C. The Mathematical Traveler: Exploring the Grand History of Numbers. Viva Books Private Limited, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.