APA (7th ed.) Citation

United States. Bureau of Entomology. (1919). European elm scale (Gossyparia spuria (Modeer)). [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Bureau of Entomology. European Elm Scale (Gossyparia Spuria (Modeer)). [Washington]: [publisher not identified], 1919.

MLA (9th ed.) Citation

United States. Bureau of Entomology. European Elm Scale (Gossyparia Spuria (Modeer)). [publisher not identified], 1919.

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