May, E. R. (1960). American intervention: 1917 and 1941. American Historical Association, Service Center for Teachers of History.
Citazione stile Chigago Style (17a edizione)May, Ernest R. American Intervention: 1917 and 1941. Washington, DC: American Historical Association, Service Center for Teachers of History, 1960.
Citatione MLA (9a ed.)May, Ernest R. American Intervention: 1917 and 1941. American Historical Association, Service Center for Teachers of History, 1960.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.