1990 census of population and housing.
Population and housing unit counts.
Puerto Rico.

APA Citation

United States. Bureau of the Census. (1993). 1990 census of population and housing. Washington, DC: U.S. Dept. of Commerce, Economics and Statistics Administration, Bureau of the Census .

MLA Citation

United States. Bureau of the Census. 1990 Census of Population And Housing. Washington, DC: U.S. Dept. of Commerce, Economics and Statistics Administration, Bureau of the Census , 1993.

Warning: These citations may not always be complete (especially for serials).