1. Economic statistics yearbook, 1977;Bank of Korea,1977
2. The national income product accounts of the U.S., 1929–1974;Bureau of Economic Analysis,1977
3. Current population reports, population characteristics;Bureau of the Census,1966
4. Census of population, 1970, Subject reports;Bureau of the Census,1973
5. Consumer expenditure survey: Interview survey, 1972–1973;Bureau of Labor Statistics,1978