R. Murao, S. Ikudome, and O. Tadauchi, “Colletes jankowskyi (Hymenoptera: Colletidae) newly recorded from Japan, with some biological notes and DNA barcodes”, J. Melittol., no. 63, pp. 1–10, Aug. 2016, doi: 10.17161/jom.v0i63.5672.