Varkey, A.J., and M.D Dlamini. 2014. “Design, Construction and Use of Solar Stills for Water Purification: A Study of their performance in Two Geographical Regions in Swaziland”. Southern African Journal of Natural and Applied Sciences (SAJNAS) 15 (1). http://ojs.uneswa.ac.sz/index.php/urejast/article/view/238.