"automatic identification system." The Oxford Companion to Ships and the Sea. Oxford University Press. 2006. Encyclopedia.com. 16 Dec. 2009 <http://www.encyclopedia.com>.
"automatic identification system." The Oxford Companion to Ships and the Sea. Oxford University Press. 2006. Encyclopedia.com. (December 16, 2009). http://www.encyclopedia.com/doc/1O225-automaticidentifictnsystm.html
"automatic identification system." The Oxford Companion to Ships and the Sea. Oxford University Press. 2006. Retrieved December 16, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O225-automaticidentifictnsystm.html