Given the current availability of different bibliometric indicators and of production and citation data sources, the following
two questions immediately arise: do the indicators’ scores differ when computed on different data sources? More importantly,
do the indicator-based rankings significantly change when computed on different data sources? We provide a case study for
computer science scholars and journals evaluated on Web of Science and Google Scholar databases. The study concludes that
Google scholar computes significantly higher indicators’ scores than Web of Science. Nevertheless, citation-based rankings
of both scholars and journals do not significantly change when compiled on the two data sources, while rankings based on the
h index show a moderate degree of variation.