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Adelaar 1981, hlm. 14–15. Adelaar, K. Alexander (1981). "Reconstruction of Proto-Batak Phonology"(PDF). Dalam Robert A. Blust. Historical Linguistics in Indonesia: Part I. NUSA: Linguistic Studies in Indonesian and Languages in Indonesia. 10. Jakarta: Universitas Katolik Indonesia Atma Jaya. hlm. 1–20.
Adelaar 1981. Adelaar, K. Alexander (1981). "Reconstruction of Proto-Batak Phonology"(PDF). Dalam Robert A. Blust. Historical Linguistics in Indonesia: Part I. NUSA: Linguistic Studies in Indonesian and Languages in Indonesia. 10. Jakarta: Universitas Katolik Indonesia Atma Jaya. hlm. 1–20.
Adelaar 1981, hlm. 18. Adelaar, K. Alexander (1981). "Reconstruction of Proto-Batak Phonology"(PDF). Dalam Robert A. Blust. Historical Linguistics in Indonesia: Part I. NUSA: Linguistic Studies in Indonesian and Languages in Indonesia. 10. Jakarta: Universitas Katolik Indonesia Atma Jaya. hlm. 1–20.
Adelaar 1981, hlm. 14. Adelaar, K. Alexander (1981). "Reconstruction of Proto-Batak Phonology"(PDF). Dalam Robert A. Blust. Historical Linguistics in Indonesia: Part I. NUSA: Linguistic Studies in Indonesian and Languages in Indonesia. 10. Jakarta: Universitas Katolik Indonesia Atma Jaya. hlm. 1–20.
Adelaar 1981, hlm. 13–14. Adelaar, K. Alexander (1981). "Reconstruction of Proto-Batak Phonology"(PDF). Dalam Robert A. Blust. Historical Linguistics in Indonesia: Part I. NUSA: Linguistic Studies in Indonesian and Languages in Indonesia. 10. Jakarta: Universitas Katolik Indonesia Atma Jaya. hlm. 1–20.
Adelaar 1981, hlm. 11–12. Adelaar, K. Alexander (1981). "Reconstruction of Proto-Batak Phonology"(PDF). Dalam Robert A. Blust. Historical Linguistics in Indonesia: Part I. NUSA: Linguistic Studies in Indonesian and Languages in Indonesia. 10. Jakarta: Universitas Katolik Indonesia Atma Jaya. hlm. 1–20.
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