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Silalahi, Marina and Nisyawati, and Purba, Endang Christine and Aini, Rani Nur (2017) The Local Knowledge By Karo Ethnic In Doulu Village, Karo District To Intercropping Agricultural. In: Proceedings of the International seminar on Science Education. Yogyakarta State University, Yogyakarta. ISBN 2476 9533
Pasaribu, Esther Naomi (2019) Tinjauan Yuridis Terhadap Penguasaan Tanah Eigendom Verponding Setelah Berlakunya Undang-Undang Pokok Agraria. S1 thesis, Universitas Kristen Indonesia.