Ismail, Ramlee, et al. “Kos Ketidakberadaan Guru Dalam Bilik Darjah: Kajian Kes Di Daerah Muallim, Perak: Cost of teachers’ Absenteeism in the Classroom: A Case Study in Muallim District, Perak”. Management Research Journal, vol. 7, Dec. 2018, pp. 75-85, https://doi.org/10.37134/mrj.vol7.7.2018.