APA (7th ed.) Citation
Gregory, R. (1971). The origins of American intervention in the First World War ([1st ed.].). Norton.
Chicago Style (17th ed.) Citation
Gregory, Ross. The Origins of American Intervention in the First World War. [1st ed.]. New York: Norton, 1971.
MLA (9th ed.) Citation
Gregory, Ross. The Origins of American Intervention in the First World War. [1st ed.]. Norton, 1971.
Warning: These citations may not always be 100% accurate.