Ramet 2006, p. 118: "For the Ustaše, religion and nationality were closely linked; Catholicism and Islam were declared to be the national religions of the Croatian people, while Orthodoxy was initially described as inherently incompatible with the Croatian state project. ... Starčević's idea that the Bosnian Muslims were the "purest" Croats was resurrected, and Muslims were given permission to build mosques in Zagreb and elsewhere in the country."
Lohse, Alexandra (2018). “Croatia”. In Megargee, Geoffrey P.; White, Joseph R.. Camps and Ghettos under European Regimes Aligned with Nazi Germany. The United States Holocaust Memorial Museum Encyclopedia of Camps and Ghettos, 1933–1945. III. Bloomington, Indiana: Indiana University Press. p. 47. ISBN978-0-25302-386-5. https://books.google.com/books?id=8nBTDwAAQBAJ
