Journal Citation Reports (JCR) This link opens in a new window"Journal Citation Reports® is 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 will show you the most frequently cited journals in a field, the highest impact journals in a field, and the largest journals in a field.