NAMI, Hugo Gabriel. Errett H. Callahan (1937-2019): Researcher, flintknapper, and artist. Journal of Lithic Studies, [S. l.], v. 6, n. 1, p. 1–12, 2019. DOI: 10.2218/jls.4124. Disponível em: https://journals.ed.ac.uk/lithicstudies/article/view/4124. Acesso em: 3 jul. 2024.