R. Vaca-Acosta, “Corporate Social Responsibility in Spanish hotel chains: determinants of its level of development and consequences: Supervisors: Dr. Alfonso Vargas-Sánchez. Institution awarding the Ph. D. Degree: University of Huelva, Spain. Date of defence: 22/03/2012”, EJTR, vol. 5, no. 2, pp. 191–195, Oct. 2012.