Dyfyniad APA

Dunbar, R., & Botha, R. (2009). Why only humans have language. Oxford University Press.

Dyfyniad Arddull Chicago

Dunbar, R., and R. Botha. Why Only Humans Have Language. Oxford University Press, 2009.

Dyfyniad MLA

Dunbar, R., and R. Botha. Why Only Humans Have Language. Oxford University Press, 2009.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.