อ้างอิง ของ อุปาทานหมู่

  1. ↑ "Doubts raised over Melbourne airport scare". (2005, 27 April). ABC News Online. [Online]. Available: <http://www.abc.net.au/news/newsitems/200504/s1353989.htm>. (Accessed: 15 April 2009).
  2. 1 2 Glenn Swogger, Jr. (1999, 1 August). Rumble in the Bronx: Mass Hysteria and the "Chemicalization" of Demonology. [Online]. Available: <http://www.acsh.org/healthissues/newsID.155/healthissue_detail.asp>. (Accessed: 15 April 2009).
  3. ↑ Clark, Jerome (1993). Unexplained! 347 Strange Sightings, Incredible Occurrences, and Puzzling Physical Phenomena. Canton, Milwaukee: Visible Ink Press. ISBN 0-8103-9436-7.