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Hills, Robert (1988). "Studies in the Syntax of Mixtecan Language 2". A Publication of The Summer Institute of Linguistics and The University of Texas at Arlington.

Romero-Mendez, Rodrigo (August 28, 2008). "A Reference Grammar of Ayutla Mixe (Tukyo'm Ayuujk)". Faculty of the Graduate School of University at Buffalo, the State University of New York.