Prayuda, Hakas, et al. “ANALISIS SIFAT FISIK DAN MEKANIK BATA BETON DI YOGYAKARTA”. Rekayasa Sipil, vol. 6, no. 1, Sept. 2018, pp. 29-40, https://publikasi.mercubuana.ac.id/index.php/jrs/article/view/3784.