Simanjutak, Johan Oberlyn, et al. “Kajian Korelasi Campuran 1:2:3 Terhadap Kuat Beton Dengan FAS (Faktor Air Semen) Yang Berbeda”. Innovative: Journal Of Social Science Research, vol. 3, no. 6, Dec. 2023, pp. 8314-21, https://j-innovative.org/index.php/Innovative/article/view/7272.