How to Write a Literature Review ？I。 The definition of Literature Review文献综述（Literautre Review）是科研论文中重要的文体之一。它以作者对各种文献资料的整理、归纳、分析和比较为基础，就某个专题的历史背景、前人的工作、讨论现状、争论的焦点及进展前景等方面进行综合、总结和评论。通过阅读文献综述，科研工作者可花费较少的时间获得较多的关于某一专题系统而具体的信息,了解其讨论现状、存在的问题和未来的进展方向.II。 The purposes of literature review And Its ComponentsA。 The Purposes On the one hand, it helps you broaden the view and perspective of the topic for your graduation thesis。 On the other hand, it helps you narrow down the topic and arrive at a focused research question。 B。 Its Components There are six parts in a complete Literature Review. 标题与作者（title and author）摘要与关键词(abstract and key words）引言(introduction)述评（review)结论（conclusion）参考文献（references)III. Classification of Source MaterialsHow can we locate the materials relevant to our topics better and faster ？ Basically ， all these source materials may be classified into four majors of sources。A: Background sources： Basic information which can usually be found in dictionaries and encyclopedia complied by major scholars or founders of the field. Three very good and commonly recommenced encyclopedias are encyclopedias ABC， namely， Encyclopedia Americana, Encyclopedia Britannica ， and Collier's Encyclopedia. There are also reference works more specialized, such as The Encyclopedia of Language and Linguistics for linguistics and TEFL studies。 Moreover, you may also find Encyclopedia on the web.B： Primary sources Those providing direct evidence, such as works of scholars of the field, biographies or autobiographies, memoirs ， speeches ， lectures, diaries ， collection of letters...
