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; this classification originated in his 1967 Ph.D. thesis The Yoruba Language in Western Nigeria: Its Major Dialect Areas, ProQuest288034744. See also Adetugbọ 1973:183-193.
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