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The subgroup described in this article is properly called "Barrier Islands–Batak"[1][2] or "Northwest Sumatra–Barrier Islands".[3][4] The latter was adopted in the Ethnologue and the Glottolog. "Northwest Sumatran" may be a handy short form but is AFAIK unsourced or at least not employed in the relevant sources.
^Nothofer, Bernd (1986). "The Barrier Island Languages in the Austronesian Language Family". In Geraghty, P., Carrington, L. and Wurm, S.A. (eds.) Focal II: Papers From the Fourth International Conference on Austronesian Linguistics, pp. 87–109. Pacific Linguistics, Series C, No. 94, Canberra, Research School of Pacific and Asian Studies, The Australian National University.
^Edwards, Owen (2015). "The Position of Enggano within Austronesian". Oceanic Linguistics 54(1): 54-109
^Adelaar, K. Alexander, and Himmelmann, Nikolaus. 2005. The Austronesian languages of Asia and Madagascar. London: Routledge.
^Ross, Malcolm (1995), "Some current issues in Austronesian linguistics", in D.T. Tryon, ed., Comparative Austronesian Dictionary, 1, 45–120. Berlin: Mouton de Gruyter.