Prŷs-Jones, Oliver E, Williams, Paul H. and Carolan, James C. (2018) Bumblebees of the Azores (Apidae: Bombus). Journal of Natural History, 52 (5-6). pp. 345-349. ISSN 0022-2933

Scriven, Jessica J., Woodall, Lucy C., Tinsley, Matthew C., Knight, Mairi E., Williams, Paul H., Carolan, James C., Brown, Mark J.F. and Goulson, Dave (2015) Revealing the hidden niches of cryptic bumblebees in Great Britain: Implications for conservation. Biological Conservation, 182. pp. 126-133. ISSN 0006-3207

Carolan, James C., Murray, Tomas E., Fitzpatrick, Una, Crossley, John, Schmidt, Hans, Cederberg, Bjorn, McNally, Luke, Paxton, Robert J., Williams, Paul H. and Brown, Mark J.F. (2012) Colour Patterns Do Not Diagnose Species: Quantitative Evaluation of a DNA Barcoded Cryptic Bumblebee Complex. PLoS ONE, 7 (1). e29251. ISSN 1932-6203

Williams, Paul H., An, Jiandong, Brown, Mark J.F., Carolan, James C., Goulson, Dave, Huang, Jiaxing and Ito, Masao (2012) Cryptic Bumblebee Species: Consequences for Conservation and the Trade in Greenhouse Pollinators. PLoS ONE, 7 (3). e32992. ISSN 1932-6203

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