1. Ecology: report warns of looming pollination crisis in North America;C Holden;Science,2006
2. Decline and conservation of bumblebees;D Goulson;Ann Rev Entomol,2008
3. Morse RA, Calderone NW (2000) The value of honey bee pollination in the United States. Bee Culture 128: Suppl 1–15.
4. Buzziness as usual? Questioning the global pollination crisis;J Ghazoul;TREE,2005
5. UK National Ecosystem Assessment (NEA) (2011) The UK National Ecosystem Assessment: Synthesis of the Key Findings. Cambridge: UNEP-WCMC.