Brysbaert et al. 2013

Brysbaert, Marc and Warriner, Amy Beth and Kuperman, Victor. 2013. Concreteness ratings for 40 thousand generally known English word lemmas. Behavior Research Methods 46. 904–-911.

@article{Brysbaert2014,
  author  = {Brysbaert, Marc and Warriner, Amy Beth and Kuperman, Victor},
  journal = {Behavior Research Methods},
  number  = {3},
  pages   = {904–-911},
  title   = {Concreteness ratings for 40 thousand generally known English word lemmas},
  volume  = {46},
  year    = {2013}
}
@article{Brysbaert2014,
  author  = {Brysbaert, Marc and Warriner, Amy Beth and Kuperman, Victor},
  journal = {Behavior Research Methods},
  number  = {3},
  pages   = {904–-911},
  title   = {Concreteness ratings for 40 thousand generally known English word lemmas},
  volume  = {46},
  year    = {2013}
}
@article{Brysbaert2014,
  author  = {Brysbaert, Marc and Warriner, Amy Beth and Kuperman, Victor},
  journal = {Behavior Research Methods},
  number  = {3},
  pages   = {904–-911},
  title   = {Concreteness ratings for 40 thousand generally known English word lemmas},
  volume  = {46},
  year    = {2013}
}