1. A method for searching for documents, comprising: receiving a search query entered into a search query window, the search query including one or more search terms; determining a set of documents responsive to the search query; determining a set of citations cited in the set of documents by extracting data having recognized citation formats from the set of documents; providing a displayed list of the set of citations that enables determination of the most frequent citation by a user viewing the displayed list; based on the one or more search terms, providing for display a set of one or more recommended sources in which to search for documents; receiving a selection of a recommended source from the set of one or more recommended sources; based on the selection of the recommended source, executing a second search query in the selected recommended source, the second search query including the one or more search terms; and providing for display a list of one or more documents in response to the second search query.
1. A method for searching for documents, comprising: receiving a search query entered into a search query window, the search query including one or more search terms; determining a set of documents responsive to the search query; determining a set of citations cited in the set of documents by extracting data having recognized citation formats from the set of documents; providing a displayed list of the set of citations that enables determination of the most frequent citation by a user viewing the displayed list; based on the one or more search terms, providing for display a set of one or more recommended sources in which to search for documents; receiving a selection of a recommended source from the set of one or more recommended sources; based on the selection of the recommended source, executing a second search query in the selected recommended source, the second search query including the one or more search terms; and providing for display a list of one or more documents in response to the second search query. 2. The method of claim 1 , wherein: the displayed list of the set of citations includes, for each citation in the set of citations, the citation and an indication of the frequency that the citation appears within the set of documents.