Underwood, E. M. (1916). Heroes of conquest and empire. The Macmillan Company.
Lua i Stíl Chicago (17ú heag.)Underwood, Etta M. Heroes of Conquest and Empire. New York: The Macmillan Company, 1916.
Lua MLA (8ú heag.)Underwood, Etta M. Heroes of Conquest and Empire. The Macmillan Company, 1916.
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