APA (7th ed.) Citation

Noel, T. J., & Smith, D. A. (2011). Colorado: The highest state (2nd ed.). University Press of Colorado.

Chicago Style (17th ed.) Citation

Noel, Thomas J., and Duane A. Smith. Colorado: The Highest State. 2nd ed. Boulder: University Press of Colorado, 2011.

MLA (9th ed.) Citation

Noel, Thomas J., and Duane A. Smith. Colorado: The Highest State. 2nd ed. University Press of Colorado, 2011.