Perceived Effectiveness Of Whatsapp Usage Among Staff Of The Department Of Mechanical Engineering, Politeknik Kota Bharu. Journal of STEM and Education, [S. l.], v. 6, n. 2, p. 154–159, 2026. Disponível em: https://journalstem.net/ojs/index.php/pkb/article/view/152.. Acesso em: 9 nov. 2026.