Armstrong, E. A. (1976). Saint Francis, nature mystic: The derivation and significance of the nature stories in the Franciscan Legend. University of California Press.
Chicago-referens (17:e uppl.)Armstrong, Edward Allworthy. Saint Francis, Nature Mystic: The Derivation and Significance of the Nature Stories in the Franciscan Legend. Berkeley: University of California Press, 1976.
MLA-referens (8:e uppl.)Armstrong, Edward Allworthy. Saint Francis, Nature Mystic: The Derivation and Significance of the Nature Stories in the Franciscan Legend. University of California Press, 1976.
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