Filioque Controversy
- Three articles from Protestant and Orthodox perspectives.
- http://mb-soft.com/believe/txn/filioque.htm

Eastern Schism
- Article from the Catholic Encyclopedia.
- http://www.newadvent.org/cathen/13535a.htm

Eastern Orthodoxy
- Article from a Catholic apologist site on the Great Schism between Rome and Constantinople.
- http://www.catholic.com/library/eastern_orthodoxy.asp

Why Is There an Eastern Question?
- Article which gives background information on the situation in the Balkans from a Catholic view.
- http://www.catholicculture.org/docs/doc_view.cfm?recnum=971

Notes on the Filioque Clause Controversy
- An essay on the development of this dispute.
- http://www.iclnet.org/pub/resources/text/history/creed.filioque.txt

Great Schism
- Several articles from a Protestant perspective on the Great Schism that divided the Catholic and Orthodox Churches.
- http://mb-soft.com/believe/txc/gschism.htm