Dialogue Institute (Temple University): http://dialogueinstitute.org/ 

Encyclopedia of Greater Philadelphia: http://philadelphiaencyclopedia.org/

Historical Society of Pennsylvania – PhilaPlace has 55+ entries on religious sites in Philly: http://www.philaplace.org/topics/134/views/1/ 

“Holy Philadelphia” (2000) http://video.whyy.org/video/2365558730/

Interfaith Center of Greater Philadelphia: http://www.interfaithcenterpa.org/

Interfaith Peace Walk: http://www.interfaithpeacewalk.org/

“Urban Trinity: The Story of Catholic Philadelphia” (2015) http://urbantrinityfilm.com/