Sinisa Jakov Marusic: Macedonia Declares Mourning For Police Killed in Gunbattles. Macedonia declared days of mourning for police killed in battles with shadowy armed formation in Kumanovo – where calm was slowly restored on Sunday. In: Balkan Insight. 10. Mai 2015, abgerufen am 12. Mai 2015 (englisch).
Vgl.: Мара Нацева и др. (ур.) „Куманово и Кумановско во НОБ 1941-1942“, Куманово, 1979, S. 605–622; bzw. Saltir Putinski:"Формирање и акции на Козјачкиот партизански одред