O'Brien Derek & Padmanabhan,Gautam Jayakumar,Navin. (2006). Penguin Landmark Quiz Book (NA.). Penguin Books.
Chicago-čujuhus (17. p.)O'Brien Derek juo Padmanabhan,Gautam Jayakumar,Navin. Penguin Landmark Quiz Book. NA. New Delhi: Penguin Books, 2006.
MLA-čujuhus (9. p.)O'Brien Derek juo Padmanabhan,Gautam Jayakumar,Navin. Penguin Landmark Quiz Book. NA. Penguin Books, 2006.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.