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WikiPedia: Đế quốc Ethiopia http://www.nationalanthems.info/et-75.htm https://news.google.com/newspapers?nid=1915&dat=19... https://archive.org/stream/worldfactbook87nati#pag... http://worldstatesmen.org/Ethiopia.html https://www.jstor.org/stable/40761842?seq=1#page_s... https://books.google.com/books?id=KWQtBAAAQBAJ&pg=... https://archive.org/details/historyofethiopi0000ad... https://archive.org/details/historyofethiopi0000ad...