APA (7th ed.) Citation

Hurd, P. D. (1980). Princiapal sunflower bees of North America with emphasis on the Southwestern United States <Hymenoptera, Apoidea>.

Chicago Style (17th ed.) Citation

Hurd, Paul David. Princiapal Sunflower Bees of North America with Emphasis on the Southwestern United States <Hymenoptera, Apoidea>. 1980.

MLA (9th ed.) Citation

Hurd, Paul David. Princiapal Sunflower Bees of North America with Emphasis on the Southwestern United States <Hymenoptera, Apoidea>. 1980.

Warning: These citations may not always be 100% accurate.