Pusoh, Gloria, Lintje Kalangi, and Sonny Pangerapan. “Does the Opsen Scheme Reduce Provincial Tax Effectiveness? Motor Vehicle Tax and Title Transfer Fee in North Sulawesi Province”. The Contrarian : Finance, Accounting, and Business Research 5, no. 2 (October 30, 2026): 391–400. Accessed November 2, 2026. https://jurnal.ywnr.org/index.php/cfabr/article/view/521.