Hadi, Titih Rejyasmito, and Eko Marpanaji. 2019. “Designing and Quality Testing of ‘Digichip’ Virtual Simulation Software of Android Platform for Mobile-Virtual Learning Supporting Vocational Mechatronics Engineering”. Jurnal Pendidikan Vokasi 9 (2):105-18. https://doi.org/10.21831/jpv.v9i2.23570.