File:Westermann 1911 Sudansprachen cover.jpg

Summary
Cover of Westermann (1911) Die Sudansprachen

Fair use rationales

 * Used in Diedrich Westermann because it is one of the major works by this author.
 * Used in Niger–Congo languages because it is one of the rare studies in which much of the Niger–Congo classification is foreshadowed
 * Used in Sudanic languages because that article is precisely about the phylum proposed in this book.