Williams, P. H., An, J., Brown, M. J. F., Carolan, J. C., Goulson, D., Huang, J., & Ito, M. (2012). Cryptic Bumblebee Species: Consequences for Conservation and the Trade in Greenhouse Pollinators. Public Library of Science.

Williams, Paul H., Jiandong An, Mark J. F. Brown, James C. Carolan, Dave Goulson, Jiaxing Huang, and Masao Ito. Cryptic Bumblebee Species: Consequences for Conservation and the Trade in Greenhouse Pollinators. Public Library of Science, 2012.

Williams, Paul H., et al. Cryptic Bumblebee Species: Consequences for Conservation and the Trade in Greenhouse Pollinators. Public Library of Science, 2012.