APA

United States, .1997 economic census. Washington, D.C: U.S. Dept. of Commerce, Economics and Statistics Administration.

Chicago

United States, .1997 economic census. Washington, D.C: U.S. Dept. of Commerce, Economics and Statistics Administration.

Harvard

United States, .1997 economic census. Washington, D.C: U.S. Dept. of Commerce, Economics and Statistics Administration.

MLA

United States, .Washington, D.C: U.S. Dept. of Commerce, Economics and Statistics Administration. .