Hoyos Torres, William, and Bertha García Sierra. 2011. “A Methodological Structure for the Integrated Management of Measurement, Assessment and Follow-up of the Quality, Environmental and Occupational Health Management Systems”. Revista Universidad EAFIT 45 (155): 60-73. https://publicaciones.eafit.edu.co/index.php/revista-universidad-eafit/article/view/5.