Libras, Brazilian Portuguese sign language, is officially recognized as a legal means of communication in "Lei 10.436". Brazilian Government. Arkiveret fra originalen 10. september 2010. Hentet 23. juli 2015.
"Demographics". Brazilian Government. Arkiveret fra originalen 17. november 2011. Hentet 8. oktober 2011.
Libras, Brazilian Portuguese sign language, is officially recognized as a legal means of communication in "Lei 10.436". Brazilian Government. Arkiveret fra originalen 10. september 2010. Hentet 23. juli 2015.