May Day in Prizren, 1920
Muhamet Pirraku (1944-2014), an academic and historian from Kosovo wrote one of the most detailed articles on how 1st of May in 1920 Prizren was celebrated. The same year experienced the first massive and internationalist May Day parade in Prizren, as well as in other cities' around it, in history. The article was published in Dituria: Revistë Shkencore e Studentëve të Kosovës, no: 1-2, 1975, Prishtina, p. 107-136.
May Day parades in early 20th Century Skopje. Memories of a CPY militant, Todor Trpkov. Published in Birlik Newspaper, Skopje, 30.04.1959