APA (7th ed.) Citation

Directories Publishing Company. (1973). Chem sources U.S.A. Directories Publishing Company, Inc..

Chicago Style (17th ed.) Citation

Directories Publishing Company. Chem Sources U.S.A. Flemington, New Jersey: Directories Publishing Company, Inc., 1973.

MLA (9th ed.) Citation

Directories Publishing Company. Chem Sources U.S.A. Directories Publishing Company, Inc., 1973.