Here are some specific sites for helping pastors to better address the issues involved in immigration.:
http://migrantchrist.blogspot.com/
http://www.christiancentury.org/article/2011-03/dislocated-exegesis
http://www.discipleshomemissions.org/pages/RIM-ColumbusDay
http://faithandimmigration.org/sites/default/files/tmp/REEL%20Images%20of%20Immigration.pdf
http://fcnl.org/issues/immigration/
http://www.nationalcathedral.org/worship/sermonTexts/ruc051211.shtml

