Author keywords ISBN title.
There are four retrieval tools * * *:
1, directory retrieval tool:
Directory-based retrieval tool is a hierarchical directory (such as library catalogue, joint catalogue, national bibliography, publishing house and bookstore catalogue) compiled by information management professionals according to a certain subject classification system on the basis of extensive collection and processing of network resources.
2. Title record retrieval tool:
Bibliographic retrieval tool is a retrieval tool that describes the appearance characteristics of documents (such as document title, author name, document source, etc.). ) takes a single document as the basic description unit and has no content summary, so it is a retrieval tool that can quickly report document information.
3. Abstract retrieval tools:
A retrieval tool is a retrieval tool that abstracts a large number of scattered documents, selects important parts and arranges them in a certain way. According to the abstract, the author can be divided into author abstract and non-author abstract (such as knowledge abstract and report abstract).
4. Index retrieval tools:
Index retrieval tool is a retrieval tool that arranges related items or knowledge units in some important documents in a specific range according to certain needs, such as book titles, periodicals, names, place names, words and so on. , and indicate the source to provide users with literature clues.