Edgerton, Michael Edward, Samuel Tan, Gabriel Evans, Hwa Jang Myung, Kyung Kim Bo, Fung-Ying Loo, Kok-Chang Pan, and Mohd Nasir Hashim. “PITCH PROFILE OF THE GLOTTAL WHISTLE (M4)”. Malaysian Journal of Science 32, no. 1 (June 27, 2013): 78–85. Accessed April 28, 2024. https://ejournal.um.edu.my/index.php/MJS/article/view/6911.