Mubai, A. ., A. Ambiyar, D. . Irfan, and M. S. . Rasul. “Flipped Direct Instruction (FDI): A New Practicum Learning Model in Vocational Education”. International Journal of Learning, Teaching and Educational Research, vol. 22, no. 7, July 2023, pp. 547-65, http://ijlter.myres.net/index.php/ijlter/article/view/1700.