Gunawan, Gunawan, and Syarifuddin Syarifuddin. “Certified and Uncertified English Teachers Regarding Their Teaching Readiness in Bone Regency: Teachers and Students’ Perception-Based”. Jurnal Studi Guru Dan Pembelajaran, vol. 3, no. 3, Dec. 2020, pp. 351-60, https://www.e-journal.my.id/jsgp/article/view/423.