Shope, I. (1959). Old Oregon Trail. American Pioneer Trails Association.
Cita Chicago Style (17a ed.)Shope, Irvin. Old Oregon Trail. [United States]: American Pioneer Trails Association, 1959.
Cita MLA (8a ed.)Shope, Irvin. Old Oregon Trail. American Pioneer Trails Association, 1959.
Precaución: Estas citas no son 100% exactas.