^Faire Atta at Ethnologue (18th ed., 2015) (subscription required) Pamplona Atta at Ethnologue (18th ed., 2015) (subscription required) Pudtol Atta at Ethnologue (18th ed., 2015) (subscription required) Villa Viciosa Agta† (?) at Ethnologue (18th ed., 2015) (subscription required)
^Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, eds. (2017). "Villa Viciosa Atta". Glottolog 3.0. Jena, Germany: Max Planck Institute for the Science of Human History.
^Reid, Lawrence A. 1994. "Possible Non-Austronesian Lexical Elements in Philippine Negrito Languages." In Oceanic Linguistics, Vol. 33, No. 1 (Jun. 1994), pp. 37-72.