Ong, J. W., and A. J. Ahmad Tajuddin. 2020. “Towards a Principled Use of L1 – Observing an EFL Teacher’s L1 Use in Rural Sabah, Malaysia”. International Journal of Learning, Teaching and Educational Research 19 (6):206-22. https://ijlter.myres.net/index.php/ijlter/article/view/312.