Vaca-Acosta, R. M., M. D. Sánchez-Fernández, and A. Vargas-Sánchez. “Factors Determining the Level of Development of Social Responsibility: Spanish Hotel Chains”. Tourism and Hospitality International Journal, vol. 7, no. 2, June 2023, pp. 107-30, doi:10.57883/thij7(2)2016.30340.