Kuperman et al. 2012

Kuperman, Victor and Stadthagen-Gonzalez, Hans and Brysbaert, Marc. 2012. Age-of-acquisition ratings for 30,000 English words. Behavior Research Methods 44. 978–990.

@article{Kuperman2012,
  author  = {Kuperman, Victor and Stadthagen-Gonzalez, Hans and Brysbaert, Marc},
  journal = {Behavior Research Methods},
  number  = {4},
  pages   = {978–990},
  title   = {Age-of-acquisition ratings for 30,000 English words},
  volume  = {44},
  year    = {2012}
}