Juwantara, Efendi, 		Suwignyo, Joko, AND 		Mangiri, Herry.
" PENGARUH PENGGUNAAN ROLLER SEPEDA MOTOR BEAT TERHADAP EFEKTIFITAS DAYA DI DAERAH PEGUNUNGAN" <em>Journal of Vocational Education and Automotive Technology</em> [Online], Volume 2 Number 1 (30 April 2020)