Ullman, J. D. (1984). Principles of database systems. Galgotia.
Chicago-čujuhus (17. p.)Ullman, Jeffrey D. Principles of Database Systems. Delhi: Galgotia, 1984.
MLA-čujuhus (9. p.)Ullman, Jeffrey D. Principles of Database Systems. Galgotia, 1984.
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