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Library of Congress – Federal Research Division (2007). “Country Profile: North Korea”(PDF). Library of Congress – Federal Research Division. 2010년 9월 6일에 확인함.
Library of Congress – Federal Research Division (2007). “Country Profile: North Korea”(PDF). Library of Congress – Federal Research Division. 2010년 9월 6일에 확인함.
Library of Congress – Federal Research Division (2007). “Country Profile: North Korea”(PDF). Library of Congress – Federal Research Division. 2010년 9월 6일에 확인함.