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On the Unity of the Church
http://www.ccel.org/fathers2/ANF-05/anf05-111.htm
Ernest Wallis translation. From Ante-Nicene Fathers (American edition), vol. 5. In HTML, with notes, at Christian Classics Ethereal Library.
The Unity of the Catholic Church
http://www.geocities.com/afrikaans_ortodoks/leesstof/unity.html
In HTML. Unnamed translator.
The Unity of the Catholic Church
http://www.churchdocs.org/fathers/cyprian/cyp-unit.txt
In plain text. Translator unnamed.