n, Khairudi, Karmila Suryani, Rini Widyastuti, and Anugerah Setiawan. 2018. “Interactive Multimedia Learning on the Basis of Problem Based Learning (PBL) for Vocational High School (VHS) Students”. International Journal of Engineering & Technology 7 (4.28): 104-8. https://doi.org/10.14419/ijet.v7i4.28.22561.