Sharma, Manika, and Tahira Khatoon. “ CO-CURRICULAR ACTIVITIES AND SCIENCE ACHIEVEMENT OF SECONDARY SCHOOL STUDENTS”. THE PRIMARY TEACHER 36, no. 1-2 (January 31, 2011): p.74–82. Accessed June 16, 2025. http://ejournals.ncert.gov.in/index.php/tpt/article/view/768.