Lewis, C. S. (1961). A preface to Paradise lost. Oxford University Press; AITBS.
芝加哥风格引文Lewis, C. S. A Preface to Paradise Lost. London ; New York; New Delhi: Oxford University Press; AITBS, 1961.
MLA引文Lewis, C. S. A Preface to Paradise Lost. Oxford University Press; AITBS, 1961.
警告：这些引文格式不一定是100％准确.