Repositorios

https://unesdoc.unesco.org/inicio https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2023/04/Logos-RE-sitio-web-UDB.png

http://www.redicces.org.sv/jspui/ https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/56.jpg

https://openknowledge.worldbank.org/ https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/55.jpg

http://www.lareferencia.info/es/ https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/54.jpg

https://core.ac.uk/ https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/53.png

https://repositorio.cepal.org/ https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/52.jpg

https://bibliotecadigital.oducal.com/ https://biblio.udb.edu.sv/biblioteca//wp-content/uploads/2021/06/51.png

https://www.wdl.org/es/ https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/50.jpg

https://www.base-search.net/ https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/49.png