Jamaludin, M. R., J. S. Bujang, M. Kusnan, and H. O. Omar. “Photosynthetic Light Responses of Wild and Cultured Halophila Ovalis”. Malaysian Journal of Science, vol. 25, no. 2, Aug. 2006, pp. 67-79, http://mojes.um.edu.my/index.php/MJS/article/view/8097.