Knell, S. J. (2012). The great fossil enigma: The search for the conodont animal. Indiana University Press.
Chicago-čujuhus (17. p.)Knell, Simon J. The Great Fossil Enigma: The Search for the Conodont Animal. Bloomington: Indiana University Press, 2012.
MLA-čujuhus (9. p.)Knell, Simon J. The Great Fossil Enigma: The Search for the Conodont Animal. Indiana University Press, 2012.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.