Anggara, A.D. , Roemintoyo and Rejekiningsih, T. 2023. Optimization of mobile learning in land surveying material for vocational high school students: A preliminary study . International Journal of Education and Practice. 11, 2 (Apr. 2023), 244–254. DOI:https://doi.org/10.18488/61.v11i2.3332.