Hurd, P. D. (1980). Princiapal sunflower bees of North America with emphasis on the Southwestern United States <Hymenoptera, Apoidea>.
Chicago-Zitierstil (17. Ausg.)Hurd, Paul David. Princiapal Sunflower Bees of North America with Emphasis on the Southwestern United States <Hymenoptera, Apoidea>. 1980.
MLA-Zitierstil (9. Ausg.)Hurd, Paul David. Princiapal Sunflower Bees of North America with Emphasis on the Southwestern United States <Hymenoptera, Apoidea>. 1980.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.