• Estudio Jurídico Serrano Internacional (Madrid central office site): www.ejsiabogados.com

• Office for economic and commercial affairs attached to the Spanish Embassy in Warsaw: www.oficinascomerciales.es

• Polish Embassy in Madrid: www.madrid.polemb.net

• Lex-Grupo: www.lexgrupo.com

• Polish-Spanish Chamber of Commerce: www.phig.pl