6[3]Biber,Douglas &Johansson,Stig & Leech,Geoffrey & Conrad Susan & Finegan,Edward.Longman Grammar of Spoken and Written English (LGSWE) (朗文英语口语和笔语语法)[M] 北京:外语教学与研究出版社,2000.
7莫莉莉,陈明瑶.论真实听力材料的语体特征[J].西安外国语学院学报,2000,(4).
8[8]Ted Power.Written versus spoken English Feature analysis.http://www.btinternet.com/～ted.power/esl0112.html.
