Key, M. R. (1978). The history and distribution of the indigenous languages of Bolivia. Los Angeles : Estados Unidos: Anual Meeting of the American Anthropological Society.

Key, Mary Ritchie. The History and Distribution of the Indigenous Languages of Bolivia. Los Angeles : Estados Unidos: Anual Meeting of the American Anthropological Society, 1978.

Key, Mary Ritchie. The History and Distribution of the Indigenous Languages of Bolivia. Los Angeles : Estados Unidos: Anual Meeting of the American Anthropological Society, 1978.