Babbie, E. (2013) The Practice of Social Research, 13th edition. Andover: Cengage Learning – Chapters 6 and 7.

Buttle, F. (1999) ‘Measurement’, in B. Brotherton (ed.), The Handbook of Contemporary Hospitality Management Research. Chichester: John Wiley and Sons – Chapter 12, pp. 233–44.

Bryman, A. (2012) Social Research Methods, 4th edition. Oxford University Press, Oxford – Chapters 7 and 17.

Collis, J. and Hussey, R. (2009) Business Research – a Practical Guide for Undergraduate and Postgraduate Students, 3rd edition. Basingstoke: Macmillan Business Press – Chapter 3.

Cooper, D.R. and Schindler, P.S. (2011) Business Research Methods, 11th edition. Singapore: Irwin/McGraw-Hill – Chapters 11 and 12.

Ekinci, Y. (2011) ‘Measurement of variables’, in E. Sirakaya-Turk, M. Uysal, W. Hammitt and J.J. Vaske (eds), Research Methods for Leisure, Recreation and Tourism. Wallingford: CABI – Chapter 4, pp. 56–71.

Gray, D.E. (2009) Doing Research in the Real World, 2nd edition. London: Sage – Chapters 6 and 7.

Kumar, R. (2011) Research Methodology: A step-by-step guide for beginners, 3rd edition. London: Sage – Chapters 5, 6, 10 and 11.

Sekaran, U. (2013) Research Methods for Business – A Skill-Building Approach, 6th edition. New York: John Wiley & Sons – Chapters 7, 8 and 9.

Silverman, D. (2012) Interpreting Qualitative Data, 4th edition. London: Sage – Part Three.

Smith, S.L.J. (2010) Practical Tourism Research. Wallingford: CABI – Chapter 6.

Wallman, N. (2011) Your Research Project: Designing and planning your work, 3rd edition. London: Sage – Chapter 3.