The mystery shopper: a tool to measure public service delivery?. Jacob, S., Schiffino, N., & Biard, B. International Review of Administrative Sciences, 84(1):164–184, SAGE Publications Sage UK: London, England, 2018.
bibtex   
@article{jacob2018mystery,
  title={The mystery shopper: a tool to measure public service delivery?},
  author={Jacob, Steve and Schiffino, Nathalie and Biard, Benjamin},
  journal={International Review of Administrative Sciences},
  volume={84},
  number={1},
  pages={164--184},
  year={2018},
  publisher={SAGE Publications Sage UK: London, England}
}

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