Johann, M. “The Importance-Performance Analysis: An Evaluation of Tourist Satisfaction With the Destination Attributes”. International Journal of Economic Practices and Theories, vol. 4, no. 5, Oct. 2014, pp. 572-8, http://mta.ase.ro/index.php/ijept/article/view/The_Importance-Performance_Analysis_an_Evaluation_of_Tourist_S.