Read the andean past in colonial texts

This article is intended to explore the possibility of writing a History about a culture without writing, as the incas. For these reason we discussed some questions, many of which are obviously rhetorical: can be history exist without written sources? How to write about the incas from the history if we lack of writing, because so far no one can read any stands which appear to be so, and is necessary to make this process only with colonial texts and material evidence?