ebrary, Inc, Vet, C., & Vetters, C. (1994). Tense and aspect in discourse. M. de Gruyter.
芝加哥风格引文ebrary, Inc, Co Vet, 与 Carl Vetters. Tense and Aspect in Discourse. Berlin ; New York: M. de Gruyter, 1994.
MLA引文ebrary, Inc, et al. Tense and Aspect in Discourse. M. de Gruyter, 1994.
警告：这些引文格式不一定是100％准确.