APA (7th ed.) Citation

(1921). Green-bug or spring grain-aphis: How to prevent its periodical outbreaks. GPO.

Chicago Style (17th ed.) Citation

Green-bug or Spring Grain-aphis: How to Prevent Its Periodical Outbreaks. [Washington]: GPO, 1921.

MLA (9th ed.) Citation

Green-bug or Spring Grain-aphis: How to Prevent Its Periodical Outbreaks. GPO, 1921.

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