"Stone chisel and yucca brush: Colorado Plateau rock art". Choice Reviews Online. 40 (6): 40–3492-40-3492. February 1, 2003. doi:10.5860/choice.40-3492 (inactive July 1, 2025). ISSN0009-4978.{{cite journal}}: CS1 maint: DOI inactive as of July 2025 (link)
"Stone chisel and yucca brush: Colorado Plateau rock art". Choice Reviews Online. 40 (6): 40–3492-40-3492. February 1, 2003. doi:10.5860/choice.40-3492 (inactive July 1, 2025). ISSN0009-4978.{{cite journal}}: CS1 maint: DOI inactive as of July 2025 (link)