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Blust, Robert (1991). "The Greater Central Philippines hypothesis". Oceanic Linguistics. 30 (2): 73–129. doi:10.2307/3623084. JSTOR3623084.
Himes, Robert S. (2002). "The Relationship of Umiray Dumaget to Other Philippine Languages". Oceanic Linguistics. 41 (2): 275–294. doi:10.1353/ol.2002.0005. JSTOR3623311.