https://biblioteca.ugb.edu.sv/cgi-bin/koha/opac-search.pl?q=ccl=Provider%3AUniversidad%20Gerardo%20Barrios%20and%20su-to%3AEDUCACI%C3%83%C2%93N%20PRIMARIA%20and%20itype%3ATESIS%20and%20au%3AM%C3%83%C2%A1rquez%20Salvador%2C%20Williams%20Edison%20and%20au%3AFunes%20de%20Ar%C3%83%C2%A9valo%2C%20Claudia%20Carolina&format=rss2 Search results for 'Provider:Universidad Gerardo Barrios and su-to:EDUCACIÓN PRIMARIA and itype:TESIS and au:Márquez Salvador, Williams Edison and au:Funes de Arévalo, Claudia Carolina' at Biblioteca UGB 0 20