Tony Gardiner. (2000). Maths challenge. Oxford: Oxford University Press.
Čikaški stil citiranjaTony Gardiner. Maths Challenge. Oxford: Oxford University Press, 2000.
MLA način citiranjaTony Gardiner. Maths Challenge. Oxford: Oxford University Press, 2000.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.