Web of Science
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Journal Citation Reportsis a comprehensive and unique resource that allows you to evaluate and compare journals using citation data drawn from over 11,000 scholarly and technical journals from more than 3,300 publishers in over 80 countries. It is the only source of citation data on journals, and includes virtually all areas of science, technology, and social sciences. Journal Citation Reports can show you the:
Most frequently cited journals in a field
Highest impact journals in a field
Largest journals in a field
Citation and article counts are important indicators of how frequently current researchers are using individual journals. By tabulating and aggregating citation and article counts, JCR offers a unique perspective for journal evaluation and comparison.
Librarian's opinion: "Very comprehensive resource; includes number of times each article was cited."