Ana Mineiro, Patrícia do Carmo, Cristina Caroça, Mara Moita, Sara Carvalho, João Paço & Ahmed Zaky (2017) Emerging linguistic features of Sao Tome and Principe Sign Language. Sign Language & Linguistics 20, 109–128.
^a Sign-language names reflect the region of origin. Natural sign languages are not related to the spoken language used in the same region. For example, French Sign Language originated in France, but is not related to French. Conversely, ASL and BSL both originated in English-speaking countries but are not related to each other; ASL however is related to French Sign Language.
^b Denotes the number (if known) of languages within the family. No further information is given on these languages.
