APA (7th ed.) Citation

Cambridge Information Group Directories. (1989). The corporate directory 1990. Cambridge Information Group Directories.

Chicago Style (17th ed.) Citation

Cambridge Information Group Directories. The Corporate Directory 1990. Gainthersburg, MD.: Cambridge Information Group Directories, 1989.

MLA (9th ed.) Citation

Cambridge Information Group Directories. The Corporate Directory 1990. Cambridge Information Group Directories, 1989.

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