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ISSN 2580-4820.
Available at: &lt;<a href="http://www.journal.iapa.or.id/pgr/article/view/1288" target="_new">http://www.journal.iapa.or.id/pgr/article/view/1288</a>&gt;. Date accessed: 17 apr. 2026.
doi: <a href="https://doi.org/10.30589/pgr.v9i3.1288">https://doi.org/10.30589/pgr.v9i3.1288</a>.