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Kirkpatrick, Douglas B. (1984). "The first primary brain-tumor operation". Journal of Neurosurgery. 61 (5): 809–13. doi:10.3171/jns.1984.61.5.0809. PMID6387062.
Andrushko, Valerie A.; Verano, John W. (September 2008). "Prehistoric trepanation in the Cuzco region of Peru: A view into an ancient Andean practice". American Journal of Physical Anthropology. 137 (1): 4–13. doi:10.1002/ajpa.20836. PMID18386793.