Hanan J. Ashur, Hussain A. M. Dauod, and Mahdi T. Muhaisen. 2011. “Effects of Hexavalent Chromium (Cr+6) on Gold Fish (Carassius Auratus L.) ”. Journal of Madenat Alelem University College 3 (1), 79-93. http://116.203.176.164/index.php/JMAUC/article/view/268.