- African Worlds : Studies in the Cosmological Ideas and Social Values of African Peoples
- African Systems of Kinship and Marriage
- Peoples of the Niger-Benue Confluence (the Nupe. the Igbira. the Igala. the Idioma-Speaking Peoples): Western Africa Part X
- Efik traders of Old Calabar,: Containing The diary of Antera Duke, an Efik slave-trading chief of the eighteenth century, together with An ethnographic sketch and notes,
- The Ibo and Ibibio-Speaking Peoples of South-Eastern Nigeria: Western Africa Part III