Armstrong, E. A. (1973). Saint Francis: Nature mystic. University of California Press.
芝加哥风格引文Armstrong, Edward Allworthy. Saint Francis: Nature Mystic. Berkeley: University of California Press, 1973.
MLA引文Armstrong, Edward Allworthy. Saint Francis: Nature Mystic. University of California Press, 1973.
警告：这些引文格式不一定是100％准确.