APA (7th ed.) Citation

Economic Information Systems, Inc. (1981). Congressional district business patterns. Economic Information Systems.

Chicago Style (17th ed.) Citation

Economic Information Systems, Inc. Congressional District Business Patterns. [New York?]: Economic Information Systems, 1981.

MLA (9th ed.) Citation

Economic Information Systems, Inc. Congressional District Business Patterns. Economic Information Systems, 1981.

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