Kajkavian
The major cities in northern Croatia are located in what was historically a Kajkavian-speaking area, mainly Zagreb, Koprivnica, Krapina, Križevci, Varaždin, Čakovec. The typical archaic Kajkavian is today spoken mainly in Hrvatsko Zagorje hills and Međimurje plain, and in adjacent areas of northwestern Croatia where immigrants and the Štokavian standard had much less influence. The most peculiar Kajkavian dialect "(Baegnunski)" is spoken in Bednja in northernmost Croatia. Many of northern Croatian urban areas today are partly Štokavianized due to the influence of the standard language and immigration of Štokavian speakers.
Snježana Kordić
With a plethora of quotations from German, French, Polish and English linguistic literature, Kordić demonstrates that the language of Croats, Serbs, Bosniaks and Montenegrins is a polycentric language, with four standard variants spoken in Croatia, Serbia, Montenegro and Bosnia and Herzegovina.