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Ladipọ, Duro. Ọba kò so (The king did not hang) — Opera by Duro Ladipọ. (Transcribed and translated by R.G. Armstrong, Robert L. Awujọọla and Val Ọlayẹmi from a tape recording by R. Curt Wittig). Ibadan: Institute of African Studies, University of Ibadan. 1972.
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Oyenuga, Soji www.YorubaForKidsAbroad.com. Yoruba. Soji and Titi Oyenuga (编). Yoruba For Kids Abroad - Learn Yoruba In 27 Days. Saskatoon, Canada: Gaptel Innovative Solutions Inc. 2007: 27 days. ISBN.
历史
Adetugbọ, Abiọdun. The Yoruba Language in Yoruba History. Biobaku, S.O. (ed.) (编). Sources of Yoruba History. 1973: 176–204.