Tobing, R. R., Sakti, A. K., & Hanny. (2020). Physical form sustainability of Huta Siallagan Samosir architecture in supporting Toba Caldera Geopark cultural tourism. ARTEKS : Jurnal Teknik Arsitektur, 5(3), 459-468. https://doi.org/10.30822/arteks.v5i3.599