A. Ghani, Azman, and Singh Navpreet. 2004. “Origin of Glomeroporphyritic Clots in the Orthopyroxene Rhyodacite from the Sempah Volcanic Complex, Peninsular Malaysia”. Malaysian Journal of Science 23 (1):137-42. http://mojes.um.edu.my/index.php/MJS/article/view/8505.