APA (7th ed.) Citation

United States National Museum. (1943). The Type Species of the Genera and Subgenera of Bees. [s.n.].

Chicago Style (17th ed.) Citation

United States National Museum. The Type Species of the Genera and Subgenera of Bees. [Washington]: [s.n.], 1943.

MLA (9th ed.) Citation

United States National Museum. The Type Species of the Genera and Subgenera of Bees. [s.n.], 1943.