(1969). The international directory of computer and information system services 1969 ([1st ed.].). Europa Publications.
Citace podle Chicago (17th ed.)The International Directory of Computer and Information System Services 1969. [1st ed.]. London: Europa Publications, 1969.
Citace podle MLA (9th ed.)The International Directory of Computer and Information System Services 1969. [1st ed.]. Europa Publications, 1969.
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