Excellence in Research and Innovation for Humanity
Mary L. G. S. Senna and  Afonso R. Aquino,  The Ecological Footprint of Tourism in Jalapão/TO/Brazil.   journal   = {International Journal of Social, Behavioral, Educational, Economic, Business and Industrial Engineering}, [online]. World Academy of Science, Engineering and Technology. November 2016, vol. 119(11). 3697 - 3702[viewed 21 July 2018]. Available from: http://waset.org/publications/10005878.