Esthus, R. A. (1970). Theodore Roosevelt and the international rivalries. Ginn-Blaisdell.
Lua i Stíl Chicago (17ú heag.)Esthus, Raymond A. Theodore Roosevelt and the International Rivalries. Waltham, Mass: Ginn-Blaisdell, 1970.
Lua MLA (9ú heag.)Esthus, Raymond A. Theodore Roosevelt and the International Rivalries. Ginn-Blaisdell, 1970.
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