APA (7th ed.) Citation

U.S. Census Bureau. (1997). Zip code business patterns (SIC). U.S. Census Bureau.

Chicago Style (17th ed.) Citation

U.S. Census Bureau. Zip Code Business Patterns (SIC). Washington, D.C.: U.S. Census Bureau, 1997.

MLA (9th ed.) Citation

U.S. Census Bureau. Zip Code Business Patterns (SIC). U.S. Census Bureau, 1997.

Warning: These citations may not always be 100% accurate.