Fitriany L, Adi PN. Application of project citizen to VAT subjects to develop 21st century skills. Harmoni. Sos.: J. Pendidik. IPS [Internet]. 2022 Jan. 31 [cited 2025 May 12];8(2):96-102. Available from: https://journal.uny.ac.id/index.php/hsjpi/article/view/46966