美国时间2013年6月19日，汤森路透发布了最新版期刊影响因子数据，以下是英文新闻发布稿：

    PHILADELPHIA, June 19, 2013 – The Intellectual Property & Science business of Thomson Reuters, the world’s leading source of intelligent information for businesses and professionals, today announced the release of the 2013 edition of its Journal Citation Reports® (JCR), the world’s most influential resource for evaluating peer-reviewed publications and the source of the annual Journal Impact Factors.

    The Journal Citation Reports provides an assessment of a journal’s standing in scholarly literature through the objective evaluation of quantifiable, statistical information. The analysis comprises citation data, impact and influence metrics, and millions of cited and citing journal data points from the Web of ScienceSM, the industry’s leading citation indices in the sciences, social sciences, arts and humanities.

    The 2013 edition, with separate sections for Science and Social Sciences, features 10,853 journal listings in 232 disciplines; 83 countries are represented. A total of 379 journals received their first Journal Impact Factor. Additionally, 33 journals were suppressed due to questionable citation activity. Suppressions aim to ensure the integrity of the reports; suppressed journals are re-evaluated after two-years for re-consideration in the JCR.

    “Since its inception in 1975, the Journal Citation Reports continues to be a reliable benchmark for assessing the impact and influence of scholarly journals worldwide,” said Marie McVeigh, director of content selection for the Web of Science, Thomson Reuters. “Thomson Reuters understands the importance of these metrics in the scholarly community and is dedicated to preserving their accuracy and reliability in the ongoing selection of the world’s top-tier international and regional journals – journals that exemplify the quality demanded by researchers and authors worldwide.”

    The journal selection process is an ongoing exercise focused on identifying, evaluating and selecting the most important and influential international and regional journals for coverage in the Web of Science. Once citations are available for a minimum two-year period, the data are analyzed and published in the JCR. The 2013 JCR edition contains data drawn from items published in 2012.

    The Journal Citation Reports, within the Thomson Reuters Research Analytics suite, enables the scholarly community to evaluate research performance and impact of institutions, researchers, authors and papers globally.

    附件是我们摘录出来的部分学科的部分期刊影响因子，供大家参考。

    全部期刊影响因子查询请访问Web of Knowledge平台上的Journal Citation Reports数据库：http://admin-apps.webofknowledge.com/JCR/JCR?SID=S1hHPj7iLlaEmoPPBe9&locale=zh_CN

    小贴士：基于影响因子的计算方式，JCR影响因子发布滞后一年，最新2013版期刊影响因子实际上是2012年数据。