M. Yamin, Bohari, Sukeri M. Yusof, Ahamad Sahali Mahadi, and Mahaira A. Kadir. 2002. “X-Ray Crystal Structures of Ortho Isomers of Chlorophenylbenzoylthiourea and Nitrophenylbenzoylthiourea”. Malaysian Journal of Science 21 (December):1-5. http://mojes.um.edu.my/index.php/MJS/article/view/8849.