[27] "Assessment of possible migration pressure and its labour market impact following EU enlargement to Central and Eastern Europe" ("Valutazione dell'eventuale pressione migratoria e del suo effetto sul mercato del lavoro conseguenti all'allargamento dell'UE all'Europa centrale ed orientale"), parte 1, John Salt e alt., Research Report RR 138, Department of Education and Employment (UK), Dicembre 1999.
[27] "Assessment of possible migration pressure and its labour market impact following EU enlargement to Central and Eastern Europe, Part 1, John Salt et al., Research Report RR138, Brits Ministerie van Onderwijs en Werkgelegenheid, december 1999