Hill, W. E. (2010). The Pony Express trail: Yesterday and today. Caxton Press.
Lua i Stíl Chicago (17ú heag.)Hill, William E. The Pony Express Trail: Yesterday and Today. Caldwell, Idaho: Caxton Press, 2010.
Lua MLA (9ú heag.)Hill, William E. The Pony Express Trail: Yesterday and Today. Caxton Press, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.