One of the two major rivers that made possible the civilization of the ancient Near East and on which Nineveh and Assher stood.
Citation for Tigris
Citation styles are based on the Chicago Manual of Style, 15th Ed., and the MLA Style Manual, 2nd Ed..
MLA
"Tigris." In A Dictionary of the Bible. Ed. W. R. F. Browning. Oxford Biblical Studies Online. May 25, 2013. <http://www.oxfordbiblicalcstudies.com/article/opr/t94/e1917>.
Chicago
"Tigris." In A Dictionary of the Bible. , edited by W. R. F. Browning. Oxford Biblical Studies Online, http://www.oxfordbiblicalcstudies.com/article/opr/t94/e1917 (accessed May 25, 2013).