https://biblioteca.ugb.edu.sv/cgi-bin/koha/opac-search.pl?q=ccl=Provider%3ACengage%20Learning%20and%20su-to%3AESTAD%C3%83%C2%8DSTICA&format=rss2 Search results for 'Provider:Cengage Learning and su-to:ESTADÍSTICA' at Biblioteca UGB 0 20