Cabrejos, Belisario. “Advertising, Direct Marketing, Promotion and Public Relations in the Marketing of Industrial Goods in Antioquia”. Revista Universidad EAFIT 38, no. 126 (June 15, 2012): 36–46. Accessed November 11, 2026. https://publicaciones.eafit.edu.co/index.php/revista-universidad-eafit/article/view/945.