Sitanggang, Nathanael, Putri Lynna Adelinna Luthan, Kemala Jeumpa, and Hongbo Ma. 2019. “The Effect of Using Real-Object Media on the Students’ Interest in Cost Estimation Learning”. Jurnal Pendidikan Teknologi Dan Kejuruan 25 (1):68-77. https://doi.org/10.21831/jptk.v25i1.22190.