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On Prayer
http://www.ccel.org/fathers2/ANF-03/anf03-51.htm
S. Thelwall translation, with notes. From the Ante-Nicene Fathers, vol. 3, American edition.
On Prayer
http://www.intratext.com/X/ENG0263.HTM
Intratext Digital Library provides the twenty-nine chapters of Tertullian's tract on prayer, each in its own file, along with concordances and word frequency lists.