• English: The Internet Encyclopedia of Philosophy. James Fieser & Bradley Dowden.
  

• English: A Glossary of Terms by William J. Tsamis.
  

• Finnish: Filosofian sanasto. Laatinut Eero Nenola.
  

• Finnish: Filosofian sanastoa.
  

• Finnish: Filosofian sanasto. Internetix. Password required.
  

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