Brain Training Puzzles Difficult Book 2. Carlton Pub.
Čikaški stil citiranja (17. izdanje)Brain Training Puzzles Difficult Book 2. London: Carlton Pub.
MLA način citiranja (9. izdanje)Brain Training Puzzles Difficult Book 2. Carlton Pub.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.