E. Khan, Muluh, Zara E. Kwaghe, and Addass A. Philip. “Certified/Non-Certified/Teacher/in/the/Chemistry/Classroom/in/North/Eastern/Nigeria:/Who/Does/a/Better/Job?”. International Journal of Academic Research in Progressive Education and Development 4, no. 1 (March 28, 2015). Accessed August 3, 2025. https://ijarped.com/index.php/journal/article/view/231.