ebrary, Inc, & Walker, J. A. (2010). Aspect in grammatical variation. John Benjamins Pub. Company.
芝加哥风格引文ebrary, Inc, 与 James A. Walker. Aspect in Grammatical Variation. Amsterdam ; Philadelphia: John Benjamins Pub. Company, 2010.
MLA引文ebrary, Inc, 与 James A. Walker. Aspect in Grammatical Variation. John Benjamins Pub. Company, 2010.
警告：这些引文格式不一定是100％准确.