First normal form (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "First normal form" in English language version.

Last modified: 06:34:34, 24 July 2026 (UTC)

Ref.Un. Ref.Website

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2^nd place

3^rd place

books.google.com (Global: 3^rd place; English: 3^rd place)

Codd, E. F. (1970). "A relational model of data for large shared data banks". Communications of the ACM. 13 (6): 377–387. doi:10.1145/362384.362685.
Codd, E. F. (1979). "Extending the database relational model to capture more meaning". ACM Transactions on Database Systems. 4 (4): 397–434. doi:10.1145/320107.320109.