Perry, J. (1991). Understanding oracle. BPB.
Chicago-čujuhus (17. p.)Perry, James. Understanding Oracle. New Delhi: BPB, 1991.
MLA-čujuhus (9. p.)Perry, James. Understanding Oracle. BPB, 1991.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.