Musafirin, Musafirin, 		Djaelani, Aunu, AND 		Apriyanto, Nuraedhi.
" PENINGKATAN HASIL BELAJAR SISTEM PENGAPIAN MELALUI METODE PROBLEM BASED LEARNING" <em>Journal of Vocational Education and Automotive Technology</em> [Online], Volume 3 Number 1 (28 April 2021)