ENGEL, Michael S.; GRISWOLD, Terry. On the classification of North American Chelostoma (Hymenoptera: Megachilidae). Journal of Melittology, [S. l.], n. 90, p. 1–6, 2019. DOI: 10.17161/jom.v0i90.11760. Disponível em: https://journals.ku.edu/melittology/article/view/11760. Acesso em: 2 apr. 2025.