APA (7th ed.) Citation

(1969). The International directory of computer and information system services 1969. Europa Publications.

Chicago Style (17th ed.) Citation

The International Directory of Computer and Information System Services 1969. London: Europa Publications, 1969.

MLA (9th ed.) Citation

The International Directory of Computer and Information System Services 1969. Europa Publications, 1969.

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