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Güldemann, Tom (2018). "Historical linguistics and genealogical language classification in Africa". In Güldemann, Tom (ed.). The Languages and Linguistics of Africa. The World of Linguistics series. Vol. 11. Berlin: De Gruyter Mouton. pp. 58–444. doi:10.1515/9783110421668-002. ISBN978-3-11-042606-9. S2CID133888593.
Güldemann, Tom (2018). "Historical linguistics and genealogical language classification in Africa". In Güldemann, Tom (ed.). The Languages and Linguistics of Africa. The World of Linguistics series. Vol. 11. Berlin: De Gruyter Mouton. pp. 58–444. doi:10.1515/9783110421668-002. ISBN978-3-11-042606-9. S2CID133888593.
Aubry, N.; Friedman, H.; Pozdniakov, K. (2004). "Proto-Yoruba-Igala Swadesh list"(PDF). Langage, Langues et Cultures d’Afrique (LLACAN), Centre National de la Récherche Sciéntifique (CNRS). Archived from the original(PDF) on 2021-01-05.
worldcat.org
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Mukarovsky, Hans. A study of Western Nigritic. Wien: Institut für Ägyptologie und Afrikanistik, Universität Wien. OCLC21527702.