The Catholic Encyclopedia was written between 1907-1912 and was uploaded to the web in 1997. As the original text has not since been revised, you would use the date 1912 in your reference list entry. Authors for each encyclopaedia entry may vary but the editors should be listed according to the example below.
In-text
(Rössler & Fanning, 1912) OR Rössler and Fanning (1912)
Reference list
Rössler, A., & Fanning, W. (1912). Woman. In C. G. Herbermann, E.A. Pace, C.B. Pallen, T.J. Shahan, & J.J. Wynne (Eds.), The Catholic encyclopedia. New Advent. http://www.newadvent.org/cathen/15687b.htm
