M. Yamin, B., S. M. Yusof, A. Sahali Mahadi, and M. A. Kadir. “X-Ray Crystal Structures of Ortho Isomers of Chlorophenylbenzoylthiourea and Nitrophenylbenzoylthiourea”. Malaysian Journal of Science, vol. 21, Dec. 2002, pp. 1-5, https://ejournal.um.edu.my/index.php/MJS/article/view/8849.