Askari, H. (1971), “Demand for Package Tour”, Journal of Transport Economics and Policy, 5(1), 40-51.
Ayazlar, R.A. (2014), “Dynamic Packaging Applications In Travel Agencies”, Procedia - Social and Behavioral Sciences, 131, 326-331.
Bai, B., S. Jang, L. Cai and J.T. O’Leary (2001), “Determinants of Travel Mode Choice of Senior Travelers to the United States”, Journal of Hospitality and Leisure Marketing, 8(3/4), 147-168.
Barros, C.P., L. Gil-Alana and C. Santos (2008), “Tourism in Azores Islands: Persistence in the Monthly Arrivals”, Instituto Superior de Economia e Gestão, DE, Working Papers No. 9.
Cohen, E. (1972), “Toward a Sociology of International Tourism”, Social Research, 39(1), 164-182.
Enoch, Y. (1996), “Contents of Tour Packages: A Cross-Cultural Comparison”, Annals of Tourism Research, 23(3), 599-616.
Esztergár-Kiss, D. and C.S. Csiszár (2015), “Evaluation of Multimodal Journey Planners and Definition of Service Levels”, International Journal of Intelligent Transportation Systems Research, 13(3), 154-165.
Esztergár-Kiss, D. and T. Kerényi (2020), “Creation of Mobility Packages based on the MaaS Concept”, Travel Behaviour and Society, 21, 307-317.
Gray, P. (1970), International Travel International Trade, Heath Lexington Books, Lexington: Massachusetts.
Hsieh, S., J.T. O’Leary and A.M. Morrison (1994), “A Comparison of Package and Non-package Travelers from the United Kingdom”, Journal of International Consumer Marketing, 6(3-4), 79-100.
Hsieh, S., J.T. O’Leary, A.M. Morrison and S. Chang (1993), “Modeling the Travel Mode Choice of Australian Outbound Travellers”, The Journal of Tourism Studies, 4(1), 51-61.
Hyde, K. and R. Lawson (2003), “The Nature of Independent Travel”, Journal of Travel Research, 42(1), 13-23.
Kamargianni, M., W. Li, M. Matyas and A. Schäfer (2016), “A Critical Review of New Mobility Services for Urban Transport”, Transportation Research Procedia, 14, 3294-3303.
Long, J.S. (1997), Regression Models for Categorical and Limited Dependent Variables, Sage Publications: Thousand Oaks, CA.
Mehmetoglu, M. (2006), “Segmenting the Nature-Based Tourists Based on Travel Mode Choice”, Journal of Hospitality and Leisure Marketing, 14(4), 47-67.
Menezes, A., Moniz, A. and C. Vieira (2008), “The Determinants of Length of Stay of Tourists in the Azores”, Tourism Economics, 14(1), 205-222.
Meurs, H. and H. Timmermans (2017), “Mobility as a Service as a Multi-Sided Market: Challenges for Modeling”, 96th Transportation Research Board (TRB) Annual Meeting, Washington, United States, 8-12 January 2017.
Pearce, G.D., L. Reid and C. Schott (2009), “Travel Arrangements and the Distribution Behaviour of New Zealand Outbound Travellers”, Journal of Travel and Tourism Marketing, 26(1), 80-97.
Plog, S.C. (1974), “Why Destination Areas Rise and Fall in Popularity”, Cornell Hotel and Restaurant Aministration Quarterly, 14(4), 55-58. <https://journals.sagepub.com/toc/cqxa/14/4> .
Poon, A. (1993), Tourism, Technology and Competitive Strategies, CAB International Books: Wallingford, Mountain.
Quiroga, I. (1990), “Characteristics of Package Tours in Europe”, Annals of Tourism Research, 17(2), 185-207.
Sheldon, J.P. and J. Mak (1987), “The Demand for Package Tours: a Mode Choice Model”, Journal of Travel Research, 25(3), 13-17.
Statistics of Portugal (2012), Statistical Yearbook of the Azores Region: 2002-2011. <http://www.ine.pt>.
Thrane, C. (2005), “Hedonic Price Models and Sun-and-Beach Package Tours: The Norwegian Case”, Journal of Travel Research, 43(3), 302-308.
Thrane, C. and E. Farstad (2012), “Nationality as a Segmentation Criterion in Tourism Research: the Case of International Tourists’ Expenditures while on Trips in Norway”, Tourism Economics, 18(1), 203-217.
Vieira, C.J., G. Couto, P. Pimentel, A. Menezes, A. Moniz and F. Sousa (2013), “The Satisfaction of the Nordic Tourist with the Azores as a Destination”, Scandinavian Journal of Hospitality and Tourism, 13(1), 58-72.
Wong, C.S. and W.Y. Kwong (2004), “Outbound Tourists’ Selection Criteria for Choosing All-Inclusive Package Tours”, Tourism Management, 25(5), 581-592.
Yamamoto, D. and A.M. Gill (1999),”Emerging Trends in Japanese Package Tourism”, Journal of Travel Research, 38(2), 134-143.
Yoon, J. and E.L. Shafer (1997), “An Analysis of Sun-spot Destination Resort Market Segments: All-inclusive Package Versus Independent Travel Arrangements”, Journal of Hospitality and Tourism Research, 21(1), 141-159.