Analysis of information sources in references of the Wikipedia article "ราชอาณาจักรยูโกสลาเวีย" in Thai language version.
the official language of the Kingdom was 'Serbo-Croato-Slovenian'
Now, however, the official language of the new state, the Kingdom of Serbs, Croats, and Slovenes, bore the unwieldy name Serbo-Croato-Slovene (srbsko-hrvatsko-slovenački or srbsko-hrvatsko-slovenski).
Similarly, the 1921 Constitution declared Serbocroatoslovenian as the official and national language of the Kingdom of Serbs, Croats, and Slovenians.
the official language of the Kingdom was 'Serbo-Croato-Slovenian'
Now, however, the official language of the new state, the Kingdom of Serbs, Croats, and Slovenes, bore the unwieldy name Serbo-Croato-Slovene (srbsko-hrvatsko-slovenački or srbsko-hrvatsko-slovenski).
Similarly, the 1921 Constitution declared Serbocroatoslovenian as the official and national language of the Kingdom of Serbs, Croats, and Slovenians.