American Heritage. (1961). Cowboys and cattle country. Harper and Brothers.
Citazione stile Chigago Style (17a edizione)American Heritage. Cowboys and Cattle Country. New York: Harper and Brothers, 1961.
Citatione MLA (9a ed.)American Heritage. Cowboys and Cattle Country. Harper and Brothers, 1961.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.