@article{BlessingNatter2019,
  author    = {Gerald Blessing and Martin Natter},
  title     = {Do mystery shoppers really predict customer satisfaction and sales performance?},
  journal   = {Journal of retailing},
  volume    = {95},
  number    = {3},
  pages     = {47 -- 62},
  doi       = {10.1016/j.jretai.2019.04.001},
  year        = {2019},
}