Tui Lee, Chin, Cheuk Weng Chin, Mohd Shahkhirat Norizan, Choon Check Tan, Mohd Salihuddin, Mohd Yusof, Zaharah Abdul Rahman, Che Fauziah Ishak, y Mohamed Hanafi. Revista Palmas 34 (1): 280-293. Accedido septiembre 18, 2019. https://publicaciones.fedepalma.org/index.php/palmas/article/view/10687.