| Jaekl, P. 2019, March 13. What is the mysterious 'global Hum' – and is it simply noise pollution? The Guardian. |
 
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| Last edited by: Mark Grimshaw-Aagaard 26/05/2021, 17:04 |
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| Statutory order on noise from wind turbines. 2019. BEK nr 135 ed. |
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| Last edited by: Mark Grimshaw-Aagaard 11/07/2022, 11:02 |
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| Strickland, A. (2023). Mysterious rumblings were recorded in Earth’s stratosphere. Retrieved May 12, 2023, from https://edition.cnn.com ... e-sounds-scn/index.html |
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| Added by: Mark Grimshaw-Aagaard 16/05/2023, 17:42 |
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| The Hum. (n.d.). Retrieved May 26, 2021, from https://en.m.wikipedia.org/wiki/The_Hum |
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| Added by: Mark Grimshaw-Aagaard 26/05/2021, 17:06 |
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