The Quality of the Relationship in the Private Security sector in Spain - Carlos del Castillo Peces; Camilo Prado Román; José Miguel Arcos de la Rosa (Management In A Smart Society: Business And Technological Challenges (Tokio) : Xxviii Congreso Internacional Aedem = 2019 Aedem International Conference : Tokio, 3 Y 4 De Septiempre De 2019, 2019)