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The fourth edition of this guide to sources of reference material has been revised to incorporate the mass of new electronic formats now available on the market. Critical and evaluative commentary is provided by contributors on each category of reference material. The categories are reference publishing, bibliographies, dictionaries, encyclopedias, biographical sources, geographical sources, local studies, community information, business and company information, current events and news, periodicals, government publications, international official publications, statistical sources, grey literature and audiovisual sources. The handbook provides a concise guide to the various sources currently in use in reference and information work.