SUPOT SEEBUT, Pariyakorn Suphap and.
 Using PBL with FILA Chart to Design Learning Activities on Fundamental  Principle of Counting to Support Problem-Solving Skills.
<strong>Journal of Community Development Research (Humanities and Social Sciences)</strong>, [S.l.], v. 9, n. 2, p. 12-22, aug. 2016.
ISSN 2985-0231.
Available at: &lt;<a href="https://www.journal.nu.ac.th/JCDR/article/view/1435" target="_new">https://www.journal.nu.ac.th/JCDR/article/view/1435</a>&gt;. Date accessed: 01 may 2025.