https://biblioteca.ugb.edu.sv/cgi-bin/koha/opac-search.pl?q=ccl=Provider%3AUniversidad%20Gerardo%20Barrios%20and%20su-to%3AMARKETING%20and%20su-to%3AMARKETING%20DIGITAL%20and%20au%3APortillo%20De%20la%20O%2C%20Jos%C3%83%C2%A9%20Rigoberto&format=rss2 Search results for 'Provider:Universidad Gerardo Barrios and su-to:MARKETING and su-to:MARKETING DIGITAL and au:Portillo De la O, José Rigoberto' at Biblioteca UGB 0 20