Khanyot, Taweesak, Preecha Sriraungrith, and Sapolachet Prachumchai. “THE RESULTS OF UTILIZING A CEFR-BASED ENGLISH LANGUAGE TRAINING PACKAGE TO IMPROVE ENGLISH PROFICIENCY LEVELS FOR 6 TH-GRADE STUDENTS”. Journal of MCU Phetchaburi Review 7, no. 1 (April 28, 2024): หน้า 224 – 236. accessed April 16, 2025. https://so03.tci-thaijo.org/index.php/JPR/article/view/273803.