Emerton, E. (1990). The correspondence of Pope Gregory VII: Selected letters from the registrum. Columbia Univ..
Chicago-čujuhus (17. p.)Emerton, Ephraim. The Correspondence of Pope Gregory VII: Selected Letters from the Registrum. New York: Columbia Univ., 1990.
MLA-čujuhus (9. p.)Emerton, Ephraim. The Correspondence of Pope Gregory VII: Selected Letters from the Registrum. Columbia Univ., 1990.
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