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The most commonly used metric for journals is "impact factor." Impact factor is calculated based on the number of articles published in the journal and the number of times those articles are cited in subsequent publications.
Right now the primary source and most referenced source is Thomson Reuters' Journal Citation Reports, or JCR for short. JCR can provide reports for individual journal titles and all journals in a specific subject area.
Interdisciplinary collection of journal articles, conference proceedings, and books. Collection of seven online database: Conference Proceedings Citation Index, Science Citation Index, Social Sciences Citation Index, Arts & Humanities Citation Index, Index Chemicus, Current Chemical Reactions, and Book Citation Index. Coverage is 1900-present.