The following reference materials, including online websites and hard copy texts, were instrumental in developing the content for the Wild Bee ID app.
Krombein, Karl V. and Paul D. Hurd, Jr. Catalog of Hymenoptera in America North of Mexico. Smithsonian Institution Press. 1979.
Michener, Charles D. The Bees of the World. Johns Hopkins University Press. 2000.
O’toole, Christopher and Anthony Raw. Bees of the World. Blandford Press. 1999.
Xerces Society. Attracting Native Pollinators. Storey Publishing. 2011.