Umi Kalthum Ngah, Shalihatun Azlin Aziz, Mohd. Ezane Aziz, Mazeda Murad, Nik Munirah Nik Mahdi, Ali Yeon Mat Shakaff, Nor Ashidi Mat Isa, Mohd. Yusoff Mashor and Mohd. Rizal Arshad
American Journal of Applied Sciences 4 ( 11 ): 865 - 873 , 2007