A. Ghani, A., and S. Navpreet. “Origin of Glomeroporphyritic Clots in the Orthopyroxene Rhyodacite from the Sempah Volcanic Complex, Peninsular Malaysia”. Malaysian Journal of Science, vol. 23, no. 1, Apr. 2004, pp. 137-42, http://mojes.um.edu.my/index.php/MJS/article/view/8505.