Tregidgo, P. S. (1979). English grammar in practice. Longman.
芝加哥风格引文Tregidgo, P. S. English Grammar in Practice. Harlow: Longman, 1979.
MLA引文Tregidgo, P. S. English Grammar in Practice. Longman, 1979.
警告：这些引文格式不一定是100％准确.
APA引文