Leydesdorff L. Caveats for the use of citation indicators in research and journal evaluations. Journal of the American Society for Information Science and Technology 2008;59(2):278-87.
Non-ISI journals (i.e. journals that are not included in the ISI dataset) can be evaluated with an "externally cited impact factor", by using ISI databases anyway. Actually, in order to construct this indicator it useful to follow a procedure, here proposed and explained, that includes search on the Web of Science and on the Journal Citation Reports.