After a short stint at the State Archives in Zrenjanin and the National Library of Serbia, he was elected as an assistant at the Institute of History in Belgrade in 1955.
[4] In 1986 Ćirković criticized the Memorandum of the Serbian Academy of Sciences and Arts, while during the Siege of Dubrovnik in 1991 he and other Yugoslav historians sent an open letter to the Yugoslavian forces asking them to not damage historical district of the city.
Of particular importance were the migrations to Hungary during the 15th and 16th centuries, as to the historian, they exposed a significant part of the Serbian population to modern European civilization.
For Ćirković, this interaction led to cultural advancement, the establishment of civil society, and bolstered resistance efforts in regions still under Ottoman dominion.
Specifically, he believed that the geographical overlap of these two populations made it absolutely impossible to create a sense of security for each of the two groups through territorial division.
He emphasized the necessity of providing each community with sufficient autonomy concerning education, language usage, and connections with their primary cultural milieu and fellow compatriots.