Alexander von Humboldt : Tofauti kati ya masahihisho

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Mstari 26:
* [http://www.archive.org/details/AlexanderVonHumboldt"Lives of the Brothers Humboldt"] an extensive biography available from the Million Book Project:
* Allgemeine Deutsche Biographie: [[s:de:ADB:Humboldt, Friedrich Wilhelm Heinrich Alexander v.|biography of Humboldt]] at [[Wikisource]]
* [http://www.globusz.com/ebooks/Equinoctial1/00000010.htm Online version of ''Travels to the Equinoctial Regions of the New World''] {{Wayback|url=http://www.globusz.com/ebooks/Equinoctial1/00000010.htm |date=20061110042732 }}
* [http://www.bbc.co.uk/radio4/history/inourtime/inourtime_20060928.shtml "Alexander von Humboldt"], from ''[[In Our Time]]'', a 45 minutes [[BBC Radio 4]] program.
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