Williams, Paul H., Brown, Mark J.F., Carolan, James C., An, Jiandong, Goulson, Dave, Aytekin, A. Murat, Best, Lincoln R., Byvaltsev, Alexandr M., Cederberg, Bjorn, Dawson, Robert, Huang, Jiaxing, Ito, Masao, Monfared, Alireza, Raina, Rifat H., Schmid-Hempel, Paul, Sheffield, Cory S., Šima, Peter and Xie, Zenghua (2012) Unveiling cryptic species of the bumblebee subgenus Bombus s. str. worldwide with COI barcodes (Hymenoptera: Apidae). Systematics and Biodiversity, 10 (1). pp. 21-56. ISSN 1477-2000

Williams, Paul H., Brown, Mark J.F., Carolan, James C., An, Jiandong, Goulson, Dave, Aytekin, A. Murat, Best, Lincoln R., Byvaltsev, Alexandr M., Cederberg, Bjorn, Dawson, Robert, Huang, Jiaxing, Ito, Masao, Monfared, Alireza, Raina, Rifat H., Schmid-Hempel, Paul, Sheffield, Cory S., Šima, Peter and Xie, Zenghua (2012) Unveiling cryptic species of the bumblebee subgenus Bombus s. str. worldwide with COI barcodes (Hymenoptera: Apidae). Systematics and Biodiversity, 10 (1). pp. 21-56. ISSN 1477-2000