E. Breva-Franch, F. Olivares-Delgado, and M. T. Benlloch-Osuna, “Sustainable Outdoor Advertising: A Professional Point of View from Spain”, CT, vol. 14, no. 1, pp. 100–115, Apr. 2023, doi: 10.34135/communicationtoday.2023.Vol.14.No.1.7.