APA način citiranja (7. izdanje)
Gregory, R. (1971). The origins of American intervention in the First World War ([1st ed.].). Norton.
Čikaški stil citiranja (17. izdanje)
Gregory, Ross. The Origins of American Intervention in the First World War. [1st ed.]. New York: Norton, 1971.
MLA način citiranja (9. izdanje)
Gregory, Ross. The Origins of American Intervention in the First World War. [1st ed.]. Norton, 1971.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.