The 2013 edition of Journal Citation Reports® (JCR) is now available via Web of Knowledge.
JCR measures the impact factor of journals, the 2013 edition contains the data for 2012. The impact factor is a measure of the frequency with which the average article in a journal has been cited in a particular year. The JCR also lists journals and their impact factors and ranking in the context of their specific field(s).
To access click here.