Marín, Heriberto A., and Elba Díaz-Toro. 2010. “The Effect of the Smoke-Free Workplace Policy in the Exposure to Secondhand Smoke in Restaurants, Pubs, and Discos in San Juan, Puerto Rico”. Puerto Rico Health Sciences Journal 29 (3). https://prhsj.rcm.upr.edu/index.php/prhsj/article/view/450.