Krisantia, Ina, et al. “Quality Assessment of Visual Landscape for Sustainable Tourism in Bogor, Puncak Cianjur, West Java, Indonesia”. International Journal of Engineering and Technology, vol. 8, no. 1.9, Jan. 2019, pp. 661-4, https://doi.org/10.14419/ijet.v8i1.9.30081.