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Dòng 30:
* Tomislav Stimac, "''[http://www.vlf.it/frequency/bands.html Definition of frequency bands (VLF, ELF... etc.)]''". IK1QFK Home Page (vlf.it).
* Douglas C. Smith, [http://www.emcesd.com/ High Frequency Measurements Web Page; Index and Technical Tidbits]. D. C. Smith Consultants, Los Gatos, CA.
* [http://www.its.bldrdoc.gov/elbert/hf.html High Frequency Propagation Models] {{Webarchive|url=https://web.archive.org/web/20120206132454/http://www.its.bldrdoc.gov/elbert/hf.html |date=2012-02-06 }}, its.bldrdoc.gov.
* [http://www.cscamm.umd.edu/programs/hfw05/ High Frequency Wave Propagation], cscamm.umd.edu.
* "[http://www.analog.com/UploadedFiles/Application_Notes/698455131755584673020828AN_345.pdf Grounding for Low- and High-Frequency Circuits] {{Webarchive|url=https://web.archive.org/web/20080528111919/http://www.analog.com/UploadedFiles/Application_Notes/698455131755584673020828AN_345.pdf |date=2008-05-28 }}" (PDF)
* "[http://www.mrec.org/pubs/HighFrequencyNoise_InformationalPage_05.pdf High frequency noise] {{Webarchive|url=https://web.archive.org/web/20130903192210/http://www.mrec.org/pubs/highfrequencynoise_informationalpage_05.pdf |date=2013-09-03 }}" (PDF)
* "[http://www.codan.com.au/HFRadio/WhyHF/tabid/305/Default.aspx Advantages of HF Radio] {{Webarchive|url=https://web.archive.org/web/20100827140028/http://www.codan.com.au/HFRadio/WhyHF/tabid/305/Default.aspx |date=2010-08-27 }}" Codan
* [http://rigreference.com/solar Solar conditions for HF-radio]
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