Muhammad Jamil, Imran Riaz Chohan, and 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 6, no. 1 (February 20, 2025): 37–49. Accessed July 1, 2025. https://www.jsrd.org.pk/index.php/jsrd/article/view/348.