Weston, G. M. (1857). The progress of slavery in the United States. The Author.
Lua i Stíl Chicago (17ú heag.)Weston, George M. The Progress of Slavery in the United States. Washington, D.C.: The Author, 1857.
Lua MLA (8ú heag.)Weston, George M. The Progress of Slavery in the United States. The Author, 1857.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.