(1990). Key indicators of county growth: 1970 - 2010 ; households, population, income, employment. NPA Data Services.
Chicago-Zitierstil (17. Ausg.)Key Indicators of County Growth: 1970 - 2010 ; Households, Population, Income, Employment. Washington, D.C: NPA Data Services, 1990.
MLA-Zitierstil (9. Ausg.)Key Indicators of County Growth: 1970 - 2010 ; Households, Population, Income, Employment. NPA Data Services, 1990.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.