Charles Darwin
Suzanne Slade
Leslie Real
Jennifer Boothroyd
Lyn Sirota
M. S. Mani
Vera Lúcia Imperatriz-Fonseca
Eric Mader
International Symposium on Pollination (8th 2000 Mosonmagyaróvár, Hungary)
National Research Council (U.S.). Committee on the Status of Pollinators in North America
Carl H. Shanks
E. Gorton Linsley
Jeff Ollerton
Dong Ren
Rita Gray
David G. Lloyd
Friedrich G. Barth