This widely followed classification is based on Adetugbọ's (1982) dialectological study — the classification originated in his 1967 PhD thesis The Yoruba Language in Western Nigeria: Its Major Dialect Areas, ProQuest288034744. See also Adetugbọ. The Yoruba Language in Yoruba History // Biobaku, Saburi O. (redaktor). Sources of Yoruba History. Oxford: Clarendon Press. 1973. 176–204 [esp. 183–193]. ISBN0-19-821669-6.
merriam-webster.com
"Yoruba". Merriam-Webster. 8 December 2022 tarixində arxivləşdirilib. İstifadə tarixi: 8 December 2022.
proquest.com
search.proquest.com
This widely followed classification is based on Adetugbọ's (1982) dialectological study — the classification originated in his 1967 PhD thesis The Yoruba Language in Western Nigeria: Its Major Dialect Areas, ProQuest288034744. See also Adetugbọ. The Yoruba Language in Yoruba History // Biobaku, Saburi O. (redaktor). Sources of Yoruba History. Oxford: Clarendon Press. 1973. 176–204 [esp. 183–193]. ISBN0-19-821669-6.
web.archive.org
"Yoruba". Merriam-Webster. 8 December 2022 tarixində arxivləşdirilib. İstifadə tarixi: 8 December 2022.