Greenbaum, S. (1996). An introduction to English grammar. Longman.
芝加哥风格引文Greenbaum, Sidney. An Introduction to English Grammar. Harlow, Essex, Eng: Longman, 1996.
MLA引文Greenbaum, Sidney. An Introduction to English Grammar. Longman, 1996.
警告：这些引文格式不一定是100％准确.