Lawlor Steven C. (1990). Computer information systems (ed.). Harcourt Brace Jovanovich.
Chicago-čujuhus (17. p.)Lawlor Steven C. Computer Information Systems. ed. New York: Harcourt Brace Jovanovich, 1990.
MLA-čujuhus (9. p.)Lawlor Steven C. Computer Information Systems. ed. Harcourt Brace Jovanovich, 1990.
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