APA (7th ed.) Citation

United States. Office of Experiment Stations. (1920). Cooperative extension work, 1921. GPO.

Chicago Style (17th ed.) Citation

United States. Office of Experiment Stations. Cooperative Extension Work, 1921. [Washington]: GPO, 1920.

MLA (9th ed.) Citation

United States. Office of Experiment Stations. Cooperative Extension Work, 1921. GPO, 1920.

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