Ball, D. America's colorful railroads.
Lua i Stíl Chicago (17ú heag.)Ball, Don. America's Colorful Railroads.
Lua MLA (8ú heag.)Ball, Don. America's Colorful Railroads.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.
Lua APA (7ú heag.)