Karlstrom, Karl E.; Lee, John P.; Kelley, Shari A.; Crow, Ryan S.; et al. (2014). „Formation of the Grand Canyon 5 to 6 million years ago through integration of older palaeocanyons”. Nature Geoscience. 7 (3): 239—244. Bibcode:2014NatGe...7..239K. doi:10.1038/ngeo2065.
Spencer, J.E.; Patchett, P.J.; Pearthree, P.A.; House, P.K.; Sarna-Wojcicki, A.M.; Wan, E.; Roskowski, J.A.; Faulds, J.E. (2013). „Review and analysis of the age and origin of the Pliocene Bouse Formation, lower Colorado River Valley, southwestern USA”. Geosphere. 9 (3): 444—459. Bibcode:2013Geosp...9..444S. doi:10.1130/ges00896.1.
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Karlstrom, Karl E.; Lee, John P.; Kelley, Shari A.; Crow, Ryan S.; et al. (2014). „Formation of the Grand Canyon 5 to 6 million years ago through integration of older palaeocanyons”. Nature Geoscience. 7 (3): 239—244. Bibcode:2014NatGe...7..239K. doi:10.1038/ngeo2065.
Spencer, J.E.; Patchett, P.J.; Pearthree, P.A.; House, P.K.; Sarna-Wojcicki, A.M.; Wan, E.; Roskowski, J.A.; Faulds, J.E. (2013). „Review and analysis of the age and origin of the Pliocene Bouse Formation, lower Colorado River Valley, southwestern USA”. Geosphere. 9 (3): 444—459. Bibcode:2013Geosp...9..444S. doi:10.1130/ges00896.1.