Stanford Encyclopedia of Philosophy | Stanford University. Cambridge University Press.
Chicago-čujuhus (17. p.)Stanford Encyclopedia of Philosophy | Stanford University. Cambridge University Press.
MLA-čujuhus (9. p.)Stanford Encyclopedia of Philosophy | Stanford University. Cambridge University Press.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.