APA (7th ed.) Citation

United States. Bureau of Reclamation. Great Plains Region. (1990). Colorado - Big Thompson Project, Colorado. The Region.

Chicago Style (17th ed.) Citation

United States. Bureau of Reclamation. Great Plains Region. Colorado - Big Thompson Project, Colorado. [Billings, Mont.?]: The Region, 1990.

MLA (9th ed.) Citation

United States. Bureau of Reclamation. Great Plains Region. Colorado - Big Thompson Project, Colorado. The Region, 1990.