Rujukan Alexander Graham Bell

  1. ↑ Gray 2006, p. 229.
  2. ↑ Bruce 1990, p. 419.
  3. ↑ Black 1997, p. 18. Quote: "He thought he could harness the new electronic technology by creating a machine with a transmitter and receiver that would send sounds telegraphically to help people hear."
  4. ↑ National Geographic Magazine
  5. ↑ MacLeod 1999, p. 19.
  6. ↑ Dunn 1990, p. 41.
  7. 1 2 Bruce 1990, p. 16.
  8. 1 2 3 Gray 2006, p. 8.
  9. ↑ Gray 2006, p. 9.
  10. ↑ Mackay 1997, p.25.
  11. 1 2 Petrie 1975, p. 7.
  12. ↑ Mackay 1997, p. 31.
  13. ↑ Gray 2006, p. 11.
  14. ↑ Town 1988, p. 7.
  15. ↑ Bruce 1990, p. 37.
  16. ↑ Shulman 2008, p. 49.
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