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《乌利希国际期刊指南》(Ulrich′s International Periodi-cals Directory)的最新版本为第29版(1990—1991)。这部国际上最著名的期刊检索工具刊仍然由美国 R.R.Bowker,the InformationReference Company出版,每两年出版一次新版。新版收录世界197个国家与地区的11,000多个出版单位的12万种期刊。新版共三卷,一、二卷为刊名索引(按英文字顺排列),第三卷的索引,包括国际机构出版物索引、主题互见索引、国际标准期刊编号(ISSN)
The latest version of the Ulrich’s International Periodi-cals Directory is 29th Edition (1990-1991). The internationally renowned journal search tool is still published by R. R. Powker, the InformationReference Company, and is published every two years. The new edition contains 120,000 journals covering over 11,000 publishing units in 197 countries and regions. The new edition consists of three volumes, one or two volumes of indexed titles (in alphabetical order) and the third volume of indexes, including indexes of publications of international agencies, indexes of thematic interviews, ISSN (International Standard Serial Number)