APA citation. Babylon. (1907). In The Catholic Encyclopedia. New York: Robert Appleton Company. http://www.newadvent.org/cathen/02179a.htm
MLA citation. "Babylon." The Catholic Encyclopedia. Vol. 2. New York: Robert Appleton Company, 1907. <http://www.newadvent.org/cathen/02179a.htm>.
Ecclesiastical approbation. Nihil Obstat. 1907. Remy Lafort, S.T.D., Censor. Imprimatur. +John M. Farley, Archbishop of New York.
Contact information. The editor of New Advent is Kevin Knight. My email address is feedback732 at newadvent.org. (To help fight spam, this address might change occasionally.) Regrettably, I can't reply to every letter, but I greatly appreciate your feedback — especially notifications about typographical errors and inappropriate ads.