U.S. Dept. of Commerce, Economics and Statistics Administration, U.S. Census Bureau,
Chirŭi ŭngdap [electronic resource] : Miguk chiyŏk sahoe chosa.
Questions and answers: American Community Survey. Korean.
Miguk chiyŏk sahoe chosa
American community survey.
Chirŭi ŭngdap [electronic resource] : Miguk chiyŏk sahoe chosa.