American Heritage. (1961). Cowboys and cattle country. Harper and Brothers.
Lua i Stíl Chicago (17ú heag.)American Heritage. Cowboys and Cattle Country. New York: Harper and Brothers, 1961.
Lua MLA (9ú heag.)American Heritage. Cowboys and Cattle Country. Harper and Brothers, 1961.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.