MUHAMMAD JAMIL; IMRAN RIAZ CHOHAN; MUHAMMAD JAFAR ALI. UNPACKING THE 4CS: THE QUALITATIVE CONTENT ANALYSIS OF 21ST CENTURY LEARNING SKILLS IN PHYSICS TEXTBOOK (GRADE IX). JOURNAL OF SOCIAL RESEARCH DEVELOPMENT, [S. l.], v. 6, n. 1, p. 37–49, 2025. DOI: 10.53664/JSRD/06-01-2025-04-37-49. Disponível em: https://www.jsrd.org.pk/index.php/jsrd/article/view/348. Acesso em: 1 jul. 2025.