Sulaiman, Jamalludin, Azlinda Azman, and Behnaz Saboori. 2014. “Development of Solar Energy in Sabah Malaysia: The Case of Trudgill’s Perception”. International Journal of Sustainable Energy and Environmental Research 3 (2):90-99. https://archive.conscientiabeam.com/index.php/13/article/view/2092.