Nuraini, Cut, Hibnul Walid, Meyga Fitri Handayani Nasution, Indra Kesuma Hadi, and Suprayitno . 2018. “Environmentally Friendly Materials Use Strategy on Heirloom Houses of Mandailing Community in Mountainous Area (Case Studies : Heirloom Houses in Singengu and Habincaran)”. International Journal of Engineering & Technology 7 (3.4): 494-97. https://doi.org/10.14419/ijet.v7i3.4.20276.