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* [http://www.orthodoxinfo.com/ecumenism/Heers-TheMissionaryRootsofModernEcumenism.pdf The Missionary Origins of Modern Ecumenism] by Fr. Peter A. Heers
* [http://www.oca.org/QA.asp?ID=27&SID=3 Orthodox Christianity and The "Branch Theory"]. OCA - Q & A.
* [http://www.incommunion.org/articles/essays/orthodoxy-ecumenism In Communion: Orthodoxy & Ecumenism]
* [http://incommunion.org/articles/ecumenical-movement/ In Communion: Ecumenical Movement], resources on the Orthodox Church and the Ecumenical Movement