Nkebi ahịrịokwu nke mbụ: Ọ hapụrụ nwunye ya, bụbu Helen Tuthill Sisson, ụmụ ya ndị nwoke bụ́ Norman F. Boas na Donald P. Boas na nwa ya nwanyị, bụ́ Barbara Crutchley. Nkebi ahịrịokwu nke abụọ: Ọ hapụrụ nwunye ya, onye bụbu Barbara Crutchley, ụmụ ya ndị nwoke bụ́ Norman F. Boas na Donald P. Boas, na nwa ya nwanyị bụ́ Helen Tuthill Sisson. Ajụjụ: Ọ̀ bụ otu ihe ka ahịrịokwu nke mbụ na nke abụọ pụtara? Ee ma ọ bụ Ee e?
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