Warsito, T. “PRODUCTIVITY AS DETERMINANT FACTOR OF INCOME DISPARITY IN INDONESIA”. Jurnal Ilmiah MEA (Manajemen, Ekonomi, & Akuntansi), Vol. 4, no. 3, Oct. 2020, pp. 938-56, http://journal.stiemb.ac.id/index.php/mea/article/view/525.