APA (7th ed.) Citation

Dun's Marketing Services. (1985). Dun's consultants directory. The Services.

Chicago Style (17th ed.) Citation

Dun's Marketing Services. Dun's Consultants Directory. Parsippany, N.J.: The Services, 1985.

MLA (9th ed.) Citation

Dun's Marketing Services. Dun's Consultants Directory. The Services, 1985.