S. A. . Adhyatma, F. A. . Nugraha, I. R. . Malau, A. . Pradana, and Y. . Fitasari, “Free Emission Testing for Motorcycle Users in the Batubulan Kangin Gianyar Environment Toward Indonesia Zero Emission”, JKPMSenyum, vol. 3, no. 1, pp. 51-58, Jun. 2023.