Hill, W. E. (2010). The Pony Express trail: Yesterday and today. Caxton Press.
Citazione stile Chigago Style (17a edizione)Hill, William E. The Pony Express Trail: Yesterday and Today. Caldwell, Idaho: Caxton Press, 2010.
Citatione MLA (9a ed.)Hill, William E. The Pony Express Trail: Yesterday and Today. Caxton Press, 2010.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.