Economic Information Systems, Inc. (1981). Zip code business patterns: The top 10,000 U.S. zip codes-- measured by business activity in ten key market sectors. Economic Information Systems.
Chicago Style (17th ed.) CitationEconomic Information Systems, Inc. Zip Code Business Patterns: The Top 10,000 U.S. Zip Codes-- Measured by Business Activity in Ten Key Market Sectors. [New York?]: Economic Information Systems, 1981.
MLA (9th ed.) CitationEconomic Information Systems, Inc. Zip Code Business Patterns: The Top 10,000 U.S. Zip Codes-- Measured by Business Activity in Ten Key Market Sectors. Economic Information Systems, 1981.
Warning: These citations may not always be 100% accurate.