A.B. Ellis 
Yoruba-Speaking Peoples of the Slave Coast of West Africa [PDF ebook] 
Their Religion, Manners, Customs, Laws, Language, Etc

The Yoruba-Speaking Peoples of the Slave Coast of West Africa (1894) is an important work of in-depth research into one of the principal indigenous communities of West Africa. The territory of the Yoruba peoples extends over the southern parts of western Nigeria and eastern Dahomey, and this book examines their religion, customs, laws and language, and contains an extensive appendix comparing the Tshi (Oji), Ga, Ewe and Yoruba languages.