- Noise and Hearing Conservation Technical Manual. Occupational Safety and Health Administration (OSHA). US Department of Labor.
- world's loudest sound
- Krakatau at Google Maps
- The Sound So Loud That It Circled the Earth Four Times. Aatish Bhatia. Nautilus (2014).
- Note on a Series of Barometrical Disturbances Which Passed over Europe between the 27th and the 31st of August, 1883. Robert H. Scott. Proceedings of the Royal Society. Vol. 36 (1 January 1883): 228-231 139-143; doi:10.1098/rspl.1883.0087
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