*[http://agrino.org/cyberdesert/zizioulas.htm One Single Source], by Metr. [[John Zizioulas]]

*[http://www.energeticprocession.com/archives/Azkoul_filioque.pdf The Filioque: A Reply to the Agreed Statement of the North American Orthodox-Catholic Theological Consultation], by Fr. Michael Azkoul

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