Tham khảo Tháp_quan_sát_UFO

  1. ↑ Associated Press, "Colo Woman builds UFO watchtower and camp," 6 August 2003.
  2. ↑ David Kelly, "Things are looking up at UFO watch tower," Lưu trữ 2012-10-23 tại Wayback Machine Los Angeles Times, 8 August 2004.
  3. ↑ Charles Laurence, "Cattle farmer diversifies and finds that her profits are out of this world," London Telegraph 5 September 2004.
  4. ↑ Charles Laurence, "UFOs better cash cow than farming," Melbourne Age, 6 September 2004.
  5. ↑ Article: COUNTDOWN for August 10, 2004, MSNBC – Part 1. | AccessMyLibrary – Promoting library advocacy
  6. ↑ NewsLibrary.com – newspaper archive, clipping service – newspapers and other news sources
  7. ↑ “Colorado Woman Turns Ranch Into Moneymaker With Ufo Watchtower”. Bản gốc lưu trữ ngày 23 tháng 10 năm 2012. Truy cập ngày 20 tháng 8 năm 2022.
  8. ↑ Archives : The Rocky Mountain News
  9. ↑ The Daily Courier – Google News Archive Search
  10. ↑ 'UFO watchtower' draws visitors

Tài liệu tham khảo

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