Yazid , Haziq Azree, and Fauziah Mohd Sa’ad. “Validity and Reliability of the Patient Health Questionnaire (PHQ-9) Instrument Among School Students”. Jurnal Pendidikan Bitara UPSI 17 (November 11, 2024): 59–70. Accessed November 15, 2024. https://ojs.upsi.edu.my/index.php/JPB/article/view/10533.