APA-ийн эшлэл(7 дахь хэвлэлт)

Preston, R. A. (1977). The defence of the undefended border: Planning for war in North America, 1867-1939. McGill-Queen's University Press.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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 -ийн эшлэл (9 дэх хэвлэлт)

Preston, Richard Arthur. The Defence of the Undefended Border: Planning for War in North America, 1867-1939. McGill-Queen's University Press, 1977.