Nder daliila etnogirapi won waɗki bayanu e siffuki gikkuuji e neɗɗaaku e iimaanaku e ɗenngal aadaaji yaadooji hawtidiriaɗi e motta gokka, Harris, (1968), e Agar (1980) wii etnogirapi hawti e laaɓi e ko wurtina nder lincitoore.