Dunbar, R. (2010). Why only humans have language. Oxford University Press.
Chicago-čujuhus (17. p.)Dunbar, R. Why Only Humans Have Language. Oxford University Press, 2010.
MLA-čujuhus (9. p.)Dunbar, R. Why Only Humans Have Language. Oxford University Press, 2010.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.