1. ↑ Wiktionary: Power Point
2. ↑ Redesign of a power point socket
3. ↑ Hubbell (2006). "Hubbell History". Hubbell Incorporated. Dicapai pada 2006-10-10.
4. ↑ Witte. "The Automobile Storage Battery Its Care and Repair". www.powerstream.com. Dicapai pada 2007-09-14.
5. ↑ Crist. "Socket Tutorial". www.mosaicshades.com. Dicapai pada 2007-09-14.
6. ↑ U.S. Patent 1,672,067 
7. ↑ Electric Current Abroad, U.S. Department of Commerce, International Trade Administration (2002), http://www.ita.doc.gov/media/Publications/pdf/current2002FINAL.pdf
8. ↑ IEC/TR 60083, Plugs and socket-outlets for domestic and similar general use standardized in member countries of IEC, International Electrotechnical Commission (2006)

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