This article is about the Batak people of Indonesia. For the Batak people of the Philippines, see Batak people (Philippines). For indigenous Negrito group of peninsular Malaysia, see Batek people.
^Na'im, Akhsan; Syaputra, Hendry (2011). Kewarganegaraan, Suku Bangsa, Agama dan Bahasa Sehari-hari Penduduk Indonesia: Hasil Sensus Penduduk 2010 [Citizenship, Ethnicity, Religion, and Daily Language of Indonesian Population, Results of the 2010 Population Census] (in Indonesian). Badan Pusat Statistik. ISBN9789790644175.
^Bungaran Antonius Simanjuntak (1994). Konflik Status dan Kekuasaan Orang Batak Toba: Bagian Sejarah batak [Conflict of Status and Power of Toba Batak People: History of Batak] (in Indonesian). Yayasan Pustaka Obor Indonesia. p. 149. ISBN60-243-3148-7.
^B.A. Simanjuntak; Hasmah Hasyim; A.W. Turnip; Jugat Purba; E.K. Siahaan (1979). Sistim Gotong Royong Dalam Masyarakat Pedesaan Daerah Sumatera Utara [Mutual Cooperation System in Rural Areas of North Sumatra] (in Indonesian). Direktorat Jenderal Kebudayaan. p. 25.
^Siahaan, Nalom (1964). Sedjarah kebudajaan Batak: suatu studi tentang suku Batak (Toba, Angkola, Mandailing, Simelungun, Pakpak Dairi, Karo) [Historical culture of Batak: a study of Batak tribes (Toba, Angkola, Mandailing, Simelungun, Pakpak Dairi, Karo)] (in Indonesian). Napitupulu. OCLC690038854.