Nababan, W., S. Sihombing, S. Peranginangin, and R. Napitupulu. “ANALISIS TEKNO EKONOMI ATAP SURYA STUDI KASUS DI KOTA MEDAN, INDONESIA”. SPROCKET JOURNAL OF MECHANICAL ENGINEERING, Vol. 5, no. 1, Aug. 2023, pp. 43 -49, doi:https://doi.org/10.36655/sprocket.v5i1.1197.