Santos, Ludoviko Carnasciali dos, and Valéria Cristina Leite Baccili. “Reflections on the Influence of the Mother Tongue in Kaingang Learning Portuguese As a Second Language”. Entretextos, vol. 7, no. 1, June 2014, pp. 42-56, doi:10.5433/1519-5392.2007v7n1p42.