The article “Jugoslavia e l' Europa unita” (Yugoslavia and united Europe) was written in Italian in the wake of the tenth anniversary of the Treaty of Rome in 1957 and the Declaration on the Name and Status of the Croatian Literary Language in 1967. Čolak stressed his belief in a united Europe, which would be constituted from nations liberated from communism and which would be extricated from every form of imperialism. Unlike Yugoslavia as a whole, the Croatian and Slovenian people do not see in the united Europe in solely material terms, but also as a cultural interest, since they belonged to it in terms of their geography, history and outlook.