Ribeiro, L., Gonçalves, E. and Guerra, R. 2020. The importance of qualification of the human resources in tourism: a study applied to travel agents in Portugal. PASOS Revista de Turismo y Patrimonio Cultural. 18, 4 (Oct. 2020), 667–682. DOI:https://doi.org/10.25145/j.pasos.2020.18.047.