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The journal impact factor is not comparable among fields of science andsocial science because of systematic differences in publication and citationbehaviour across disciplines. In this work, a source normalization of thejournal impact factor is proposed. We use the aggregate impact factor of theciting journals as a measure of the citation potential in the journal topic,and we employ this citation potential in the normalization of the journalimpact factor to make it comparable between scientific fields. An empiricalapplication comparing some impact indicators with our topic normalized impactfactor in a set of 224 journals from four different fields shows that ournormalization, using the citation potential in the journal topic, reduces thebetween-group variance with respect to the within-group variance in a higherproportion than the rest of indicators analysed. The effect of journalself-citations over the normalization process is also studied.

Journal topic citation potential and between-field comparisons: The topic normalized impact factor