
http://www.etui.org/Publications2/Books/Innovative-union-practices-in-Central-Eastern-Europe

https://carnegieendowment.org/files/2-24_Lehne-EU_Geopolitics.pdf

https://theconversation.com/renuncia-o-reafirmacion-pedro-sanchez-detiene-su-agenda-mientras-espana-esta-en-vilo-228721