APA

United States, .Per capita income,median family money income, and low income status in 1969 for states, standard metropolitan statistical areas, andcounties: 1970. Washington: For sale by the Supt. of Docs.

Chicago

United States, .Per capita income,median family money income, and low income status in 1969 for states, standard metropolitan statistical areas, andcounties: 1970. Washington: For sale by the Supt. of Docs.

Harvard

United States, .Per capita income,median family money income, and low income status in 1969 for states, standard metropolitan statistical areas, andcounties: 1970. Washington: For sale by the Supt. of Docs.

MLA

United States, .Washington: For sale by the Supt. of Docs. .