APA (7th ed.) Citation

Economic Information Systems, Inc. (1981). The Second 1,500 companies (1981 ed.). Economic Information Systems.

Chicago Style (17th ed.) Citation

Economic Information Systems, Inc. The Second 1,500 Companies. 1981 ed. New York, N.Y.: Economic Information Systems, 1981.

MLA (9th ed.) Citation

Economic Information Systems, Inc. The Second 1,500 Companies. 1981 ed. Economic Information Systems, 1981.