*David Deming: The Hum: An Anomalous Sound Heard Around the World. Journal of Scientific Exploration, Vol. 18, No. 4, pp. 571–595, 2004
*H.G. Leventhall: Low Frequency Noise and Annoyance. Noise and Health, Volume 6, Number 23, Apr - Jun 2004 , pp. 59-72(14)
*H.G. Leventhall: Low Frequency Noise and Annoyance. Noise and Health, Volume 6, Number 23, Apr - Jun 2004 , pp. 59-72(14)
−
*Corliss, W. R. (1983). Earthquakes, Tides, Unidentified Sounds and Related Phenomena, A Catalog
+
*Corliss, W. R. (1983). Earthquakes, Tides, Unidentified Sounds and Related Phenomena, A Catalog of Geophysical Anomalies. Glen Arm, MD: The Sourcebook Project.
−
of Geophysical Anomalies. Glen Arm, MD: The Sourcebook Project.