Friedrich, M. P., Gouveia, F. C., & Leta, J. (2012). The producer and the content of information in the internet: studying the topic “environmental education” in brazilian webpages and sites. Encontros Bibli: Revista eletrônica De Biblioteconomia E Ciência Da informação, 17(34), 157–170. https://doi.org/10.5007/1518-2924.2012v17n34p157