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Montaño-Valle, A. Sustainability Strategy As a Source of Competitive Advantages in the Tourism Industry. A Model for the Integration of Natural Resources: Supervisors: Dr. Alfonso Vargas-Sánchez. Institution Awarding the Ph. D. Degree: University of Huelva, Spain. Date of Defence: 30/06/2015. EJTR 2016, 14, 106-109.