1. Presser, S., Couper, M. P., Lessler, J. T., Martin, E., Martin, J., Rothgeb, J. M., et al. (2004). Methods for testing and evaluating survey questions. Public Opinion Quarterly, 68, 109–130.
2. Converse, J. M., & Presser, S. (1986). Survey questions. Handcrafting the standardized questionnaire. Newbury Park: Sage Publications Inc.
3. Backstrom, C. H., & Hursch-César, G. (1981). Survey Research (2nd ed.). New York: Macmillan Publishing Company.
4. Streiner, D. L., & Norman, G. R. (2003). Health Measurement Scales. A practical guide to their development and use (3rd ed.). Oxford: Oxford University Press.
5. Groves, R. M., Fowler, F. J., Couper, M. P., Lepkowski, J. M., Singer, E., & Tourangeau, R. (2004). Survey methodology. Hoboken NJ: Wiley.