Michael C. Frank, Daniel L. Everett, Evelina Fedorenko, Edward Gibson:Number as a cognitive technology: Evidence from Pirahã language and cognition. In: Cognition. Band108, Nr.3. Elsevier, 2008, S.819–824, doi:10.1016/j.cognition.2008.04.007 (stanford.edu[PDF; 328kB; abgerufen am 23.Dezember 2012]).
Daniel L. Everett:Cultural Constraints on Grammar and Cognition in Pirahã. Another Look at the Design Features of Human Language. In: Current Anthropology. Band46, Nr.4. The Wenner-Gren Foundation for Anthropological Research, 2005 (pnglanguages.org[PDF; 961kB; abgerufen am 23.Dezember 2012]).pnglanguages.org (Memento vom 25. März 2007 im Internet Archive)
Michael C. Frank, Daniel L. Everett, Evelina Fedorenko, Edward Gibson:Number as a cognitive technology: Evidence from Pirahã language and cognition. In: Cognition. Band108, Nr.3. Elsevier, 2008, S.819–824, doi:10.1016/j.cognition.2008.04.007 (stanford.edu[PDF; 328kB; abgerufen am 23.Dezember 2012]).
Daniel L. Everett:Cultural Constraints on Grammar and Cognition in Pirahã. Another Look at the Design Features of Human Language. In: Current Anthropology. Band46, Nr.4. The Wenner-Gren Foundation for Anthropological Research, 2005 (pnglanguages.org[PDF; 961kB; abgerufen am 23.Dezember 2012]).pnglanguages.org (Memento vom 25. März 2007 im Internet Archive)