Noor Asmahan Abdullah, Siti Noor Ismail, and Marini Kassim. “PROFESSIONAL COMPETENCY INSTRUMENT: DEVELOPMENT AND VALIDATION OF A FOUR-FACTOR MODEL”. INTERNATIONAL JOURNAL OF EDUCATION, PSYCHOLOGY AND COUNSELLING (IJEPC), vol. 10, no. 58, June 2025, doi:10.35631/IJEPC.1058001.