Eguzo, C. V., et al. “Developing a Functional Light-Emitting Diode (LED) Indicator in a Heat Controlled Environment”. Journal of Chemical, Mechanical and Engineering Practices (JCMEP), vol. 2, no. 3, Dec. 2012, pp. 24-27, http://icidr.org.ng/index.php/Jcmep/article/view/1096.