@book{Willis2005,
author = {Willis, G.},
title= {Cognitive interviewing: A tool for improving questionnaire design},
year = {2005},
doi = {10.4135/9781412983655},
URL = {https://doi.org/10.4135/9781412983655.},
address = {Thousand Oaks, CA},
publisher = {Sage Publications},
}