二次文献又称二级次文献，是对一次文献进行加工整理后的产物，即对无序的一次文献的外部特征如题名、作者、出处等进行著录，或将其内容压缩成简介、提要或文摘，并按照一定的学科或专业加以有序化而形成的文献形式，如目录、文摘杂志（包括简介式检索刊物）等。它们都可用作文献检索工具，能比较全面、系统地反映某个学科、专业或专题在一定时空范围内的文献线索，是积累、报道和检索文献资料的有效手段。
中文二次文献 Chinese second documents
二次文献数据库 the Second Literature Database
苏美尔二次文献的指标 ISSL
二次文献评价 Literature assessment
二次学术文献 secondary academic document
Secondary document and network document can be used to communicate information,improve use factor and reveal the academic value of document.
二次文献及网络文献的利用,能够起到沟通信息,提高原始文献利用率的作用,并且向读者揭示了期刊论文的学术价值。
参考来源 - 心理学期刊二次文献转载及W eb下载率分析·2,447,543篇论文数据，部分数据来源于NoteExpress
论文须用到至少两种原始文献和四种二次文献。
Your paper must draw on at least two primary sources, as well as at least four secondary sources.
其次，至少读四种二次文献，并说出原始文献不同的诠释方法。
Second, you have to read at least four secondary sources and try to figure out the various ways that the primary sources have been interpreted.
本次作业要写10 - 12页，关于一个具体的历史争论，并引用主要和二次文献证明。
In this assignment you will be writing a 10-12 page paper that advances a specific historical argument and supports it by citing primary and secondary sources.
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