Coba jelasin Rujukan dari Sungai Colorado dong

Darrah, William Culp, Ralph V. Chamberlin, and Charles Kelly, editors. (2009). The Exploration of the Colorado River in 1869 and 1871–1872: Biographical Sketches and Original Documents of the First Powell Expedition of 1869 and the Second Powell Expedition of 1871–1872. ISBN 978-0-87480-963-3.

Fleck, Richard F., editor. (2000). A Colorado River Reader. ISBN 978-0-87480-647-2.

Fowler, Don D., editor. (2012). Cleaving an Unknown World: The Powell Expeditions and the Scientific Exploration of the Colorado Plateau. ISBN 978-1-60781-146-6.

Gregory, Herbert E., William Culp Darrah, and Charles Kelly, editors. (2009). The Exploration of the Colorado River and the High Plateaus of Utah by the Second Powell Expedition of 1871–1872. ISBN 978-0-87480-964-0.

Summitt, April R. (2013)  Contested Waters: An Environmental History of the Colorado River

1854 report from the U.S. Army Corps of Topographical Engineers: Report of an expedition down the Zuni and Colorado Rivers