Below are links to reference sources and collections that are most useful for these subjects:
The Oxford Encyclopedia of African Thought (AC reference DT14 .I74 2010)
Africana: The Encyclopedia of The African and African American Experience (AC reference DT14 .A37435 2005)
African Ethnonyms: Index to Art-producing Peoples of Africa (GN645 .B53 1996)
A Brief History of Art: with Special Reference to West Africa (N7398 .A798 2004)
Nigerian Artists: A Who's Who & Bibliography (AC reference N7399.N5 K46 1993)
Yoruba Art and Language: Seeking The African in African Art (N7399.N5 A25 2014)
Yoruba: Nine Centuries of African Art and Thought (x N7399.N52 Y68 1989)
Reference sources can include encyclopedias, bibliographies, dictionaries, handbooks, and atlases.
You can find the Library's collection of reference books on Floor 1 of Frost. We also have many online databases that include collections of edited scholarly encyclopedias, dictionaries, and other reference sources.