* [http://www.wordoftruthradio.com/questions/38.html What is the Nicolaitan spirit or doctrine? Who are they? (Revelation 2:6 & 15) (wordoftruthradio.com)]
* [http://www.wordoftruthradio.com/questions/38.html What is the Nicolaitan spirit or doctrine? Who are they? (Revelation 2:6 & 15) (wordoftruthradio.com)]
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* [http://en.wikipedia.org/wiki/Nicolaism Nicolaism - Wikipedia (en.wikipedia.org)]
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* [https://en.wikipedia.org/wiki/Nicolaism Nicolaism - Wikipedia (en.wikipedia.org)]
* [http://www.bible.ca/history/philip-schaff/#second History of the Christian Church, Volume II, § 122 by Philip Schaff]
* [http://www.bible.ca/history/philip-schaff/#second History of the Christian Church, Volume II, § 122 by Philip Schaff]
* [http://www.newadvent.org/cathen/11067a.htm Nicolaites or Nicolaitans - Catholic Encyclopedia (newadvent.org)]
* [http://www.newadvent.org/cathen/11067a.htm Nicolaites or Nicolaitans - Catholic Encyclopedia (newadvent.org)]