Steffen, J. O. (1977). William Clark: Jeffersonian man on the frontier. University of Oklahoma Press.
Cita Chicago Style (17a ed.)Steffen, Jerome O. William Clark: Jeffersonian Man on the Frontier. Norman: University of Oklahoma Press, 1977.
Cita MLA (8a ed.)Steffen, Jerome O. William Clark: Jeffersonian Man on the Frontier. University of Oklahoma Press, 1977.
Precaución: Estas citas no son 100% exactas.