@article{CaliendoClementShehu2015,
  author    = {Marco Caliendo and Michel Clement and Edlira Shehu},
  title     = {The effect of individual professional critics on books' sales: capturing selection biases from observable and unobservable factors},
  journal   = {Marketing letters : a journal of research in marketing},
  volume    = {26},
  number    = {4},
  pages     = {423 -- 436},
  doi       = {10.1007/s11002-015-9391-9},
  year      = {2015},
}