Sant'Anna, M.M.M. et al. 2016. Augmentative and alternative communication users and their interlocutors impressions on using graphic symbol system. Revista de Terapia Ocupacional da Universidade de São Paulo. 27, 3 (Dec. 2016), 322–328. DOI:https://doi.org/10.11606/issn.2238-6149.v27i3p322-328.