Orr, Michael C., et al. “Megachile (Megachile) Montivaga (Hymenoptera: Megachilidae) Nesting in Live Thistle (Asteraceae: Cirsium)”. Journal of Melittology, no. 48, Mar. 2015, pp. 1-6, https://doi.org/10.17161/jom.v0i48.4847.