One of Paul's fellow prisoners who was associated with him in sending greetings to the Church at Colossae (Col. 4: 14); but according to 2 Tim. 4: 10 Demas later deserted Paul and went (home?) to Thessalonica.
Citation for Demas
Citation styles are based on the Chicago Manual of Style, 15th Ed., and the MLA Style Manual, 2nd Ed..
MLA
"Demas." In A Dictionary of the Bible. Ed. W. R. F. Browning. Oxford Biblical Studies Online. Jun 19, 2013. <http://www.oxfordbiblicalcstudies.com/article/opr/t94/e509>.
Chicago
"Demas." In A Dictionary of the Bible. , edited by W. R. F. Browning. Oxford Biblical Studies Online, http://www.oxfordbiblicalcstudies.com/article/opr/t94/e509 (accessed Jun 19, 2013).