APA (7th ed.) Citation

(1971). The International Directory of Computer and Information System Services: 1971. The Intergovernmental Bureau for Informatics.

Chicago Style (17th ed.) Citation

The International Directory of Computer and Information System Services: 1971. Rome: The Intergovernmental Bureau for Informatics, 1971.

MLA (9th ed.) Citation

The International Directory of Computer and Information System Services: 1971. The Intergovernmental Bureau for Informatics, 1971.

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