This widely followed classification is based on Adetugbọ's 1982 dialectological study;[11] this classification originated in his 1967 PhD thesis The Yoruba Language in Western Nigeria: Its Major Dialect Areas, ProQuest288034744. See also Adetugbọ 1973, pp. 183–193. Adetugbọ, Abiọdun (1973). "The Yoruba Language in Yoruba History". In Biobaku, Saburi O. (ed.). Sources of Yoruba History. Oxford: Clarendon Press. pp. 176–204. ISBN0-19-821669-6.
Asubiaro, Toluwase V. (2014). "Effects of Diacritics on Web Search Engines' Performance for Retrieval of Yoruba Documents". Journal of Library and Information Studies. 12 (1): 1–19. doi:10.6182/jlis.2014.12(1).001.
This widely followed classification is based on Adetugbọ's 1982 dialectological study;[11] this classification originated in his 1967 PhD thesis The Yoruba Language in Western Nigeria: Its Major Dialect Areas, ProQuest288034744. See also Adetugbọ 1973, pp. 183–193. Adetugbọ, Abiọdun (1973). "The Yoruba Language in Yoruba History". In Biobaku, Saburi O. (ed.). Sources of Yoruba History. Oxford: Clarendon Press. pp. 176–204. ISBN0-19-821669-6.
Compare for example the following remark by Adetugbọ 1967, as cited in Fagborun 1994, p. 25: "While the orthography agreed upon by the missionaries represented to a very large degree the phonemes of the Abẹokuta dialect, the morpho-syntax reflected the Ọyọ-Ibadan dialects." Adetugbọ, Abiọdun (1967). The Yoruba Language in Western Nigeria: Its Major Dialect Areas (Thesis). Columbia University. ProQuest288034744 Fagborun, J. Gbenga (1994). The Yoruba Koiné – Its History and Linguistic Innovations. LINCOM Linguistic Edition vol. 6. München/Newcastle: LINCOM Europe. ISBN3-929075-47-4.
Orie, Ọlanikẹ Ọla (2013). "Yoruba and Yoruboid languages". Encyclopedia of Linguistics. Hoboken: Taylor and Francis. pp. 1200–1204. ISBN9786610156009. OCLC1109207232.
Orie, Ọlanikẹ Ọla (2012). Acquisition reversal : the effects of postlingual deafness in Yoruba. Berlin, Boston: De Gruyter. p. 43. OCLC836821267.
worldcat.org
DELAB International Newsmagazine, November 2005 1465-4814
A lecture by Abu-Abdullah Adelabu of AWQAF Africa, London titled: "The History Of Islam in 'The Black History'" DELAB International Newsmagazine, April 2003 1465-4814