Leite Filho, Geraldo Alemandro, et al. “Analysis of Levels Disclosure of Sustainability Reports of Brazilian Companies A + the Global Reporting Initiative GRI 2007”. Revista De Contabilidade E Organizações, vol. 3, no. 7, Dec. 2009, pp. 43-59, https://doi.org/10.11606/rco.v3i7.34749.