A Relational Model of Data for Large Shared Data Banks. Codd, E. F. CACM, 13(6):377--387, 6, 1970.
A Relational Model of Data for Large Shared Data Banks [pdf]Paper  bibtex   
@article{Codd1970,
  author    = {Edgar F. Codd},
  title     = {{A Relational Model of Data for Large Shared Data Banks}},
  journal   = {CACM},
  pages     = {377--387},
  year      = {1970},
  month     = 6,
  volume    = {13},
  number    = {6},
  url ={http://www.seas.upenn.edu/~zives/03f/cis550/codd.pdf},
  urldate={2015-05-13},
}
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