Y. Novita, B. H. Iskandar, B. Murdiyanto, B. Wiryawan, and H. Hariyanto, “KERAGAAN FREE SURFACE MODEL PALKA BERBENTUK KOTAK DAN SILINDER”, Jurnal Marfis, vol. 1, no. 2, pp. 21–28, Feb. 2012, doi: 10.29244/jmf.1.2.21-28.