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Baris 50:
* [http://www.sil.si.edu/digitalcollections/HistoryCultureCollections/SIL-029-015/pdf/SIL-029-015.pdf The Watch Factories of America Past and Present by Henry G. Abbott (1888)]
* [http://www.fhs.ch/ Federation of the Swiss Watch Industry FH]
* [http://raredigitalwatches.com/ Museum of Vintage Rare Digital LCD Wrist Watches]
* [http://v3.espacenet.com/textdoc?DB=EPODOC&IDX=GB218487&F=0 UK patent GB218487, Improvements relating to wrist watches], 1923 patent resulting from John Harwood's invention of a practical self-winding watch mechanism.
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