You will almost always use at least one AND operator. Bibliography is the description of publication data of a source. Boolean operators the words AND , OR , and NOT can be used with most search engines and databases to customize a query. These terms are used in conjunction with search terms or keywords . Databases frequently use controlled vocabularies.
Library catalogs use controlled vocabularies for subject headings.
Searches using controlled vocabularies differ from keyword-based searches. Full text records are useful as they allow the researcher the ability to immediately access information without having to locate the hard copy cited by the database hit a hit is a item returned as a result of a search conducted on a search engine keywords keywords that describe the topic or subject of your search that are entered into a search engine keyword search search engines frequently conduct searches in a keyword mode by searching all text contained in the database for the desired terms. Keyword searches are generally less reliable than subject searches . Effective keyword searches usually require Boolean operators . MLA Modern Language Association guidelines for the format of bibliographies .