Simanjuntak, J. O., T. E. Saragi, S. Simanjuntak, and T. Sipayung. “HUBUNGAN TANAH DASAR TERHADAP PERKERASAN LENTUR (FLEXIBLE PAVEMENT) JALAN RAYA”. Jurnal Visi Eksakta, vol. 2, no. 1, Jan. 2021, pp. 21-30, https://ejournal.uhn.ac.id/index.php/eksakta/article/view/190.