Mukherjee, P.K. “1. W5H of Science 2. W5H of Technology Author Rakesh Mohan Hallen Publisher Vigyan Prasar”. SCHOOL SCIENCE 49, no. 1 (March 31, 2011): p.81–82. Accessed April 28, 2025. http://14.139.250.109:8090/index.php/SS/article/view/911.