Extend your reading even further with these texts!

De Keulenaer, F. (2008) Panel survey. In P. J. Lavrakas (ed.), Encyclopedia of Survey Research Methods. Thousand Oaks, CA: Sage.

Griffin, A. and Hauser, J. R. (1993) The voice of the customer. Marketing Science, 12 (1), pp. 1–27.

Yang, Z., Wang, X. and Su, C. (2006) A review of research methodologies in international business. International Business Review, 15 (6), pp. 601–617.