LUMBANSIANTAR, Royu.
 Applying Problem-Based Learning and Drill Method to Enhance Critical Thinking and Learning Outcomes.
<strong>Soedirman Economics Education Journal</strong>, [S.l.], v. 7, n. 1, aug. 2025.
ISSN 2686-6277.
Tersedia pada: &lt;<a href="https://jos.unsoed.ac.id/index.php/seej/article/view/16015" target="_new">https://jos.unsoed.ac.id/index.php/seej/article/view/16015</a>&gt;. Tanggal Akses: 29 aug. 2025