Yunus, Y., Monica Fransisca, & Renny Permata Saputri. (2022). Testing the Effectiveness and Practicality of Android Media in Vocational Schools by Using the 4-D Development Model. JITACS: Journal of Information Technology and Computer Science, 1(2), 51-58. https://doi.org/10.31849/jitacs.v1i2.9845