Cita APA (7a ed.)

Smith, D. A. (2008). Rocky Mountain Heartland: Colorado, Montana, and Wyoming in the Twentieth Century. University of Arizona Press.

Cita Chicago Style (17a ed.)

Smith, Duane A. Rocky Mountain Heartland: Colorado, Montana, and Wyoming in the Twentieth Century. Tucson: University of Arizona Press, 2008.

Cita MLA (8a ed.)

Smith, Duane A. Rocky Mountain Heartland: Colorado, Montana, and Wyoming in the Twentieth Century. University of Arizona Press, 2008.