SIAGIAN, Philips Pasca G; SINAGA, Bornok; MULYONO, Mulyono. Analysis of Difficulty of Student’s Geometry Problem Solving Based on Van Hiele’s Thinking Theory with Macromedia Flash. International Journal on Emerging Mathematics Education, [S. l.], v. 3, n. 2, p. 162–176, 2020. DOI: 10.12928/ijeme.v3i2.13658. Disponível em: https://journal.uad.ac.id/index.php/IJEME/article/view/13658. Acesso em: 4 nov. 2024.