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References
- 1 2 Mark, Darren F.; Gonzalez, Silvia; Huddart, David; Böhnel, Harald (May 2010). "Dating of the Valsequillo volcanic deposits: resolution of an ongoing archaeological controversy in Central Mexico". Journal of Human Evolution. 58 (5): 441–5. doi:10.1016/j.jhevol.2010.02.009. PMID 20363014.
- ↑ González, Silvia; Huddart, David; Bennett, Matthew R.; González-Huesca, Alberto (February 2006). "Human footprints in Central Mexico older than 40,000 years". Quaternary Science Reviews. 25 (3–4): 201–222. doi:10.1016/j.quascirev.2005.10.004.
- ↑ Renne, Paul R.; Feinberg, Joshua M.; Waters, Michael R.; Arroyo-Cabrales, Joaquin; Ochoa-Castillo, Patricia; Perez-Campa, Mario; Knight, Kim B. (1 December 2005). "Age of Mexican ash with alleged 'footprints'". Nature. 438 (7068): E7–E8. doi:10.1038/nature04425. PMID 16319838.
- ↑ Rose, James (February 2006). "Editorial". Quaternary Science Reviews. 25 (3–4): 199–200. doi:10.1016/j.quascirev.2006.01.005.
- ↑ "Oldest American footprints". Radio National. 8 February 2006.
- ↑ Morse, Sarita Amy; Bennett, Matthew R.; Gonzalez, Silvia; Huddart, David (September 2010). "Techniques for verifying human footprints: reappraisal of pre-Clovis footprints in Central Mexico". Quaternary Science Reviews. 29 (19–20): 2571–2578. doi:10.1016/j.quascirev.2010.03.012.
- ↑ Walker, Adele (23 July 2010). "Footprint evidence for early occupation of the Americas Refuted". Natural Environment Research Council.