Serra, J., J. Lima, M. do R. Borges, N. Marujo, and A. M. Ferreira. “Segmenting Tourists by Expenditure Patterns: An Instrument for Enhancing Tourism Economic Benefits on a Portuguese World Heritage Site”. Journal of Tourism & Development, Vol. 2, no. 27/28, Jan. 2017, pp. 117-9, doi:10.34624/rtd.v2i27/28.8219.