Pierce, J. R. (1981). Signals: The telephone and beyond. San Francisco: W. H. Freeman and Company.
Trích dẫn kiểu ChicagoPierce, John R. Signals: The Telephone and Beyond. San Francisco: W. H. Freeman and Company, 1981.
Deismireacht MLAPierce, John R. Signals: The Telephone and Beyond. San Francisco: W. H. Freeman and Company, 1981.
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