Periodicals are reproduced by permission of the publisher. The Wilson OmniFile databases feature both free-text and controlled vocabulary searching. Free-text searching provides keyword access to a variety of fields in the record, including the article title and the abstract. Controlled vocabulary searching provides access to the record through subject headings, periodical title, document type and other terms. The Wilson OmniFile databases use a subject authority file with subject headings derived from the literature itself, reference works, and other Wilson indexes.
Subject headings reflect current terminology.
H.W. Wilson's Name Authority File is used to verify all corporate names, personal names, and uniform titles used as subjects.