You already know the basics. You know that in 1939, the Yugoslav philosopher and psychologist Vladimir Dvorniković published a monumental (over 900 pages!) work attempting to answer an impossible question: Is there a common psychological character of South Slavs?
It is important to note that , not "Jugoslovena" (though the latter is a variant spelling sometimes used in casual search queries). vladimir dvornikovic karakterologija jugoslovena pdf better
Because the book is (Dvorniković died 1956 – in EU life+70 years means protected until 2026; in US uncertain), you cannot freely download a scan from most public sites without copyright violation. However: You already know the basics