S. H., Ibrahim, Teo W.C., and Baharun A. “A Study on Suitable Habitat for Swiftlet Farming”. Journal of Civil Engineering, Science and Technology 1, no. 1 (August 1, 2009): 1–7. Accessed July 23, 2024. https://publisher.unimas.my/ojs/index.php/JCEST/article/view/67.