On "Human Factors Comparison of a Procedural and a Nonprocedural Query Language".

Donald D. Chamberlin: On "Human Factors Comparison of a Procedural and a Nonprocedural Query Language". ACM Trans. Database Syst. 7(2): 316-317(1982)

@article{DBLP:journals/tods/Chamberlin82,
  author    = {Donald D. Chamberlin},
  title     = {On "Human Factors Comparison of a Procedural and a Nonprocedural
               Query Language"},
  journal   = {ACM Trans. Database Syst.},
  volume    = {7},
  number    = {2},
  year      = {1982},
  pages     = {316-317},
  ee        = {db/journals/tods/Chamberlin82.html},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

Joint ACM SIGMOD / IEEE Computer Society Anthology

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References

[1]: Charles Welty, David W. Stemple: Human Factors Comparison of a Procedural and a Nonprocedural Query Language. ACM Trans. Database Syst. 6(4): 626-649(1981)