ผลต่างระหว่างรุ่นของ "ภาษาราชการ"

* (1990) "Writing Systems of the World: Alphabets, Syllabaries, Pictograms", ISBN 0804816549 —— the book lists official languages of the countries of the world, among other information, although it contains errors; e.g., it names English as the official language of the United States.