Magyar Nyelvtudományi Társaság (Society of Hungarian Linguistics), Magyar nyelv, Volume 18, Akadémiai Kiadó, 1922, p. 142, Cited: "Kokos (Kakas), Kolumbán (Kálmán), Kopov (Kopó), Kokot (Kakat hn.) stb. Bármely ilyen Ko- szótagon kezdődő tulajdonnévnek lehet a Kosa a származéka. E Kosa szn. van nézetünk szerint Kassa (régen Kossa -=: Kosa) város nevében is/Kokos (Kakas), Kolumbán (Kálmán), Kopov (Kopó), Kokot (Kakat hn.) etc., any proper nouns that begin with 'Ko' syllable may have Kosa derivative, in the name of Kassa as well (its old form Kossa, Kosa)"
Matica slovenská, Kniha, Matica slovenská, 2008, p. 16
Károly Kocsis, Eszter Kocsisné Hodosi, Ethnic Geography of the Hungarian Minorities in the Carpathian Basin, Simon Publications LLC, 1998, p. 46-47 [1][permanent dead link]
Dreisziger, Nándor F. (1972). "New Twist to an Old Riddle: The Bombing of Kassa (Košice), June 26, 1941". Journal of Modern History. 44 (2): 232–42. doi:10.1086/240751. S2CID143124708.
Štefánik, Martin; Lukačka, Ján, eds. (2010). Lexikón stredovekých miest na Slovensku [Lexicon of Medieval Towns in Slovakia] (PDF) (in Slovak and English). Bratislava: Historický ústav SAV. p. 194. ISBN978-80-89396-11-5. Archived from the original(PDF) on 2 March 2014. Retrieved 31 May 2019.
gedenkstaetten-uebersicht.de
"Memorial plaque in the synagogue of Košice". Holocaust Memorials: Monuments, Museums and Institutions in Commemoration of Nazi Victims. Berlin, Germany: Stiftung Topographie des Terrors. Retrieved 20 October 2019.
"Kosice Airport Climate Normals 1991–2020". World Meteorological Organization Climatological Standard Normals (1991–2020). National Oceanic and Atmospheric Administration. Archived from the original on 7 August 2023. Retrieved 7 August 2023.
Dreisziger, Nándor F. (1972). "New Twist to an Old Riddle: The Bombing of Kassa (Košice), June 26, 1941". Journal of Modern History. 44 (2): 232–42. doi:10.1086/240751. S2CID143124708.
"Technická univerzita Košice"(PDF) (in Slovak). Ústav informácií a prognóz školstva. Archived from the original(PDF) on 27 February 2008. Retrieved 14 February 2008.
Štefánik, Martin; Lukačka, Ján, eds. (2010). Lexikón stredovekých miest na Slovensku [Lexicon of Medieval Towns in Slovakia] (PDF) (in Slovak and English). Bratislava: Historický ústav SAV. p. 194. ISBN978-80-89396-11-5. Archived from the original(PDF) on 2 March 2014. Retrieved 31 May 2019.
"Kosice Airport Climate Normals 1991–2020". World Meteorological Organization Climatological Standard Normals (1991–2020). National Oceanic and Atmospheric Administration. Archived from the original on 7 August 2023. Retrieved 7 August 2023.
"Technická univerzita Košice"(PDF) (in Slovak). Ústav informácií a prognóz školstva. Archived from the original(PDF) on 27 February 2008. Retrieved 14 February 2008.