Costain, T. B. (1960). The Chord of Steel: Alexander Graham Bell and the invention of the telephone. New York: Doubleday and Company.
Trích dẫn kiểu ChicagoCostain, Thomas B. The Chord of Steel: Alexander Graham Bell and the Invention of the Telephone. New York: Doubleday and Company, 1960.
ציטוט MLACostain, Thomas B. The Chord of Steel: Alexander Graham Bell and the Invention of the Telephone. New York: Doubleday and Company, 1960.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.