M.A, Hapipah, Sharifuddin M. Zain, Wan Jefrey B, Rahuma S.M, Sharifah Rohaiza S.O, Noorlidah Abdullah, and Teoh H.L. 2004. “Spectral, Electrochemical and Anti-Microbial Studies of Nicotinic Acid Hydrazide Schiff Base Complexes of Cobalt (II) and Manganese (II)”. Malaysian Journal of Science 23 (1):129-36. http://jice.um.edu.my/index.php/MJS/article/view/8504.