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, p. 110-125, apr. 2026.
ISSN 2686-6277.
Available at: &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;. Date accessed: 01 may 2026.
doi: <a href="https://doi.org/10.32424/seej.v7i1.16015">https://doi.org/10.32424/seej.v7i1.16015</a>.