Carle, Rainer, et al. (1987). Cultures and Societies of North Sumatra. Berlin: D. Reimer Verlag.
Cunningham, Clark N. (1958). The Postwar Migration of the Toba-Bataks to East Sumatra. Yale University Southeast Asia Studies, Cultural Report no. 5. New Haven.
Kipp, Rita Smith, and Richard Kipp, eds. (1983). Beyond Samosir: Recent Studies of the Batak Peoples of Sumatra. Ohio University Papers in International Studies, Southeast Asia Series, no. 62. Athens.
Siagian, T. P. (1966). "A Bibliography of the Batak Peoples." Indonesia 2:161-185.
Singarimbun, Masri (1975). Kinship, Descent, and Alliance among the Karo Batak. Berkeley and Los Angeles: University of California Press.
Vergouwen, J. C. (1933). The Customary Law of the Toba Bataks of Northern Sumatra. The Hague: Martinus Nijhoff.