APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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

Kontuz: berrikusi erreferentzia hauek erabili aurretik.