K.Oberoi, P~Kataria, M.K.Sidhu Narinder and Jatinder. “Use of Box-Type Solar Cookers by Rural Families”. Indian Journal of Extension Education, vol. 27, no. 3-4, Dec. 1991, pp. 43-57, https://epubs.icar.org.in/index.php/IJEE/article/view/160556.