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An abstracting service is a service that provides abstracts of publications, often on a subject or group of related subjects, usually on a subscription basis.〔Manzer, B. M. (1977). ''The Abstract Journal, 1790-1920. Origin, Development and Diffusion''. Metuchen, N.J.: The Scarecrow Press.〕 An indexing service is a service that assigns descriptors and other kinds of access points to documents. The word indexing service is today mostly used for computer programs, but may also cover services providing back-of-the-book indexes, journal indexes, and related kinds of indexes. An indexing and abstracting service is a service that provides shortening or summarizing of documents and assigning of descriptors for referencing documents.〔Klempner, Irving M. (1968). ''Diffusion of abstracting and indexing services for government-sponsored research''. Metuchen, N.J. Scarecrow Press.〕 The product is often an abstracts journal or a bibliographic index, which may be a subject bibliography or a bibliographic database. Guidelines for indexing and abstracting, including the evaluation of such services, are given in the literature of library and information science.〔Lancaster, F. W. (1991/1998/2003). ''Indexing and abstracting in theory and practice''. London: Library Association. (1st ed. 1991; 2nd ed. 1998; 3rd. ed. 2003).〕 ==See also== * Bibliography * Citation index * Guide to information sources * List of academic databases and search engines * Subject indexing 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Indexing and abstracting service」の詳細全文を読む スポンサード リンク
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