De Coy, R. H., & Kahn, R. (1969). Robert H. De Coy's This is progress: The blue book manual of Nigritian history : American descendants of African origin. Nigritian.
Lua i Stíl Chicago (17ú heag.)De Coy, Robert H., agus Roselle Kahn. Robert H. De Coy's This Is Progress: The Blue Book Manual of Nigritian History : American Descendants of African Origin. [Los Angeles]: Nigritian, 1969.
Lua MLA (9ú heag.)De Coy, Robert H., agus Roselle Kahn. Robert H. De Coy's This Is Progress: The Blue Book Manual of Nigritian History : American Descendants of African Origin. Nigritian, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.