Budi Santosa Study Program of Vocational Education, Universitas Ahmad Dahlan, Jl. Pramuka No. 42 Sidikan, Yogyakarta 5516 Indonesia
Pramudita Budiastuti Study Program of Electronics Engineering Vocational Education, Universitas Ahmad Dahlan, Jl. Ring Road Selatan, Tamanan, Banguntapan, Bantul, Yogyakarta 55166 Indonesia
Purnawan Purnawan Study Program of Automotive Technology Vocational Education, Universitas Ahmad Dahlan, Jl. Ahmad Yani (Ringroad Selatan) Tamanan Banguntapan Bantul Yogyakarta 55166 Indonesia
Muhammad Sayuti Study Program of Vocational Education, Universitas Ahmad Dahlan, Jl. Pramuka No. 42 Sidikan, Yogyakarta 5516 Indonesia