1. Abramson, J.H, Abramson, Z.H. 2008. Research methods in community medicine. In: Survey, Epidemiological Research, Programme Evaluation, Clinical Trials. 6th Edition, Wiley, Chichester, 179.
2. Cooper, C.J., Cooper, S.P., del Junco, D.J., Shipp, E.M., Whitworth, R., Cooper, S.R. 2006. Web-based data collection: Detailed methods of a questionnaire and data gathering tool. Epidemiol Perspect Innov 3, 1–11.
3. Curb, J.D., Ford, C., Hawkins, C.M., Smith, E.O., Zimbaldi, N., Carter, B., Cooper, C. 1983. A coordinating center in a clinical trial: The Hypertension Detection and Follow-up Program. Control Clin Trials 4, 171–186.
4. Davis, B.R., Slymen, D.J., Cooper, C., Mutchler, L. 1985. A distributed data processing system in a multicenter clinical trial. In: ASA Proceedings of the Statistical Computing Section, Las Vegas, 89–96.
5. Migliardi, A. 2008. Come costruire un questionario: Alcuni spunti della ricerca operativa. Centro di Documentazione Regionale per la Promozione della Salute, Grugliasco (Torino), Italy. http://www.dors.it/alleg/newcms/201306/questionario.pdf .