Ven. Indapala; Chantimachaiamorn, C.; Thitavangso, P. V. The Development of English-Speaking Skill by Using Problem-Based Learning for the First Year B.A. Students of Teaching English (International Program) in Education Faculty at Mahachulalongkomrajavidyalaya University. Mahachulalongkornrajavidyalaya University 2024, 5, 37-49.