Lobel 2013, p. 88. Lobel, Jason William (2013). Philippine and North Bornean Languages: Issues in Description, Subgrouping, and Reconstruction (PhD thesis). University of Hawaii at Manoa. hdl:10125/101972.
Lobel 2013. Lobel, Jason William (2013). Philippine and North Bornean Languages: Issues in Description, Subgrouping, and Reconstruction (PhD thesis). University of Hawaii at Manoa. hdl:10125/101972.
Robinson 2008, p. 55. Robinson, Laura C. (2008). Dupaningan Agta: Grammar, Vocabulary, and Texts (PhD thesis). University of Hawaii at Manoa. hdl:10125/20681.
Robinson 2008, p. 21. Robinson, Laura C. (2008). Dupaningan Agta: Grammar, Vocabulary, and Texts (PhD thesis). University of Hawaii at Manoa. hdl:10125/20681.
Headland, Thomas N. (2003). "Thirty endangered languages in the Philippines"(PDF). Work Papers of the Summer Institute of Linguistics, University of North Dakota. 47. Archived from the original(PDF) on 15 December 2017. Retrieved 7 December 2017.
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Headland, Thomas N. (2003). "Thirty endangered languages in the Philippines"(PDF). Work Papers of the Summer Institute of Linguistics, University of North Dakota. 47. Archived from the original(PDF) on 15 December 2017. Retrieved 7 December 2017.