Buchan, J. (1998). The thirty-nine steps. Oxford: Oxford Univ. Press.
Trích dẫn kiểu ChicagoBuchan, John. The Thirty-nine Steps. Oxford: Oxford Univ. Press, 1998.
Deismireacht MLABuchan, John. The Thirty-nine Steps. Oxford: Oxford Univ. Press, 1998.
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