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Nordahl, Konrad (1973). Gode arbeidsår. Oslo: Tiden. s. 147, 148. ISBN9788210008245. «For de skandinaviske land, spesielt Norge, var Storbritannia den store veileder, ikke de kontinentale land.»
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«EU's pionerer». Arkivert fra originalen 25. desember 2018. Besøkt 27. januar 2019. «Johan Willem Beyen (pdf)»
«The Messina Declaration»(PDF). Centre for Studies on Federalism. Arkivert fra originalen(PDF) 11. mai 2021. Besøkt 25. februar 2021. «The governments of the Federal Republic of Germany, Belgium, France, Italy, Luxembourg and the Netherlands believe the time has come to take a new step on the road of European construction. They are of the opinion that this objective should be achieved first of all in the economic sphere. They believe that the establishment of a united Europe must be achieved through the development of common institutions, the progressive fusion of national economies, the creation of a common market, and the gradual harmonization of their social policies. Such an agenda seems indispensable to them if Europe is to preserve the standing which she has in the world, to restore the influence and her prestige, and to improve steadily the living standard of the population.»
