Nuraini, C. (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), pp. 294–297. doi:10.14419/ijet.v7i3.4.20298.