Preston, R. A. (1977). The defence of the undefended border: Planning for war in North America, 1867-1939. McGill-Queen's University Press.
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Chicago Style (17th ed.) Zitazioa
Preston, Richard Arthur. The Defence of the Undefended Border: Planning for War in North America, 1867-1939. Montreal: McGill-Queen's University Press, 1977.
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MLA (9th ed.) Zitazioa
Preston, Richard Arthur. The Defence of the Undefended Border: Planning for War in North America, 1867-1939. McGill-Queen's University Press, 1977.
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Kontuz: berrikusi erreferentzia hauek erabili aurretik.