SILALAHI, Ira Valentina; 						NINGRUM, Harini Fajar; 						HELIA, Suhelmi.
 Single Index Model Dalam Membentuk Portofolio Optimal Pada Saham Perusahaan Jakarta Islamic Index.
<strong>JURNAL ADMINISTRASI KANTOR</strong>, [S.l.], v. 9, n. 2, p. 273-286, dec. 2021.
ISSN 2527-9769.
Available at: &lt;<a href="https://ejournal-binainsani.ac.id/index.php/JAK/article/view/1700" target="_new">https://ejournal-binainsani.ac.id/index.php/JAK/article/view/1700</a>&gt;. Date accessed: 07 july 2026.
doi: <a href="https://doi.org/10.51211/jak.v9i2.1700">https://doi.org/10.51211/jak.v9i2.1700</a>.