Preston, R. A. (1977). The defence of the undefended border: Planning for war in North America, 1867-1939. McGill-Queen's University Press.
芝加哥风格引文Preston, Richard Arthur. The Defence of the Undefended Border: Planning for War in North America, 1867-1939. Montreal: McGill-Queen's University Press, 1977.
MLA引文Preston, Richard Arthur. The Defence of the Undefended Border: Planning for War in North America, 1867-1939. McGill-Queen's University Press, 1977.
警告：这些引文格式不一定是100％准确.