Cita APA (7th ed.)

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.

Cita Chicago (17th ed.)

De Coy, Robert H., i 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.

Cita MLA (9th ed.)

De Coy, Robert H., i Roselle Kahn. Robert H. De Coy's This Is Progress: The Blue Book Manual of Nigritian History : American Descendants of African Origin. Nigritian, 1969.