Halim, Siana, and Indriati N Bisono. “REGRESSION ANALYSIS OF PRODUCTIVITY USING MIXED EFFECT MODEL”. Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri 9, no. 2 (January 31, 2008): 125-130. Accessed May 5, 2024. https://jurnalindustri.petra.ac.id/index.php/ind/article/view/16712.