PUTRI, Theresia Kusuma; 						WAWORUNTU, Freetje.
 Analisis Logam Timbal (Pb) sebagai Pembelajaran Menggunakan Model Problem Based Learning Kabupaten Kepulauan Sangihe.
<strong>Oxygenius Journal Of Chemistry Education</strong>, [S.l.], v. 2, n. 1, p. 10-15, june 2020.
ISSN 2686-4649.
Available at: &lt;<a href="http://indochembull.com/index.php/oxygenius/article/view/134" target="_new">http://indochembull.com/index.php/oxygenius/article/view/134</a>&gt;. Date accessed: 21 jan. 2021.
doi: <a href="https://doi.org/10.37033/ojce.v2i1.134">https://doi.org/10.37033/ojce.v2i1.134</a>.