Heywood, W. (1921). A history of Pisa, eleventh and twelfth centuries. Cambridge University Press.
芝加哥风格引文Heywood, William. A History of Pisa, Eleventh and Twelfth Centuries. Cambridge: Cambridge University Press, 1921.
MLA引文Heywood, William. A History of Pisa, Eleventh and Twelfth Centuries. Cambridge University Press, 1921.
警告：这些引文格式不一定是100％准确.
