Ludwig, E. (1937). The Nile: The life-story of a river. New York: The Viking press.
Trích dẫn kiểu ChicagoLudwig, Emil. The Nile: The Life-story of a River. New York: The Viking press, 1937.
MLA CitationLudwig, Emil. The Nile: The Life-story of a River. New York: The Viking press, 1937.
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