Bujang, J. S., M. R. Jamaludin, M. Kusnan, and H. Omar. “Shading Responses of the Seagrass, Halophila Ovalis: A Prelimin”. Malaysian Journal of Science, vol. 24, no. 1, June 2005, pp. 23-29, https://juku.um.edu.my/index.php/MJS/article/view/17159.