(1989). The Niger-Congo languages: A classification and description of Africa's largest language family. Univ. Press of America.
Chicago-Zitierstil (17. Ausg.)The Niger-Congo Languages: A Classification and Description of Africa's Largest Language Family. Lanham u.a: Univ. Press of America, 1989.
MLA-Zitierstil (9. Ausg.)The Niger-Congo Languages: A Classification and Description of Africa's Largest Language Family. Univ. Press of America, 1989.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.