Darmawan, Rizal Rahmat. “Analysis of the Total Value of Productivity Factors in the Manufacturing Industry in East Java”. Jurnal Ilmu Ekonomi Terapan 1, no. 1 (June 25, 2016): 51–64. Accessed June 16, 2025. https://e-journal.unair.ac.id/JIET/article/view/1823.