“…However, Hammarfelt (2016: 115) observes a shift from investigating coverage issues towards studying the characteristics of SSH publication practices and developing bibliometric approaches sensitive to the organization of SSH research fields. This includes, but is not limited to, extending bibliometric analyses to non-source items (Butler and Visser, 2006;Chi, 2014) or the relatively new Book Citation Index (Gorraiz et al, 2013), using other databases like Google Scholar (Kousha and Thelwall, 2009) or data from social media services, the so-called altmetrics (Holmberg and Thelwall, 2014;Mohammadi and Thelwall, 2014;Zuccala et al, 2015;Zuccala and Cornacchia, 2016), analysing the inclusion in library catalogues (White et al, 2009), exploring national databases with full coverage , extending data to references in research grant proposals (Hammarfelt, 2013) or to book reviews (Zuccala and van Leeuwen, 2011;Zuccala et al, 2015), exploring collaboration (Ossenblok and Engels, 2015) and publication patterns (Chi, 2012;Ossenblok et al, 2012;Verleysen and Weeren, 2016). From a more pragmatic point of view, attempts are made to "weigh" the various outputs, such as journals or books in the SSH, similar to the journal impact factor, commonly used in the sciences (Giménez-Toledo, 2016).…”