Gretton, R. H. (1917). The English Middle Ages. G. Bell and Sons.
芝加哥风格引文Gretton, R. H. The English Middle Ages. London: G. Bell and Sons, 1917.
MLA引文Gretton, R. H. The English Middle Ages. G. Bell and Sons, 1917.
警告：这些引文格式不一定是100％准确.
APA引文