Wulandari B, Surjono HD. Pengaruh problem-based learning terhadap hasil belajar ditinjau dari motivasi belajar PLC di SMK. jpv [Internet]. 2013 Jun. 30 [cited 2025 May 5];3(2):178-91. Available from: https://journal.uny.ac.id/index.php/jpv/article/view/1600