Subject-specific encyclopedias contain entries focusing on one field of study.
Use an encyclopedia:
Concise Routledge Encyclopedia of Philosophy by 
The Oxford Companion to Philosophy by 
Routledge Encyclopedia of Philosophy by 
The Concise Encyclopedia of Western Philosophy and Philosophers by Routledge Encyclopedia of Philosophy 10V by The Edinburgh Encyclopedia of Continental Philosophy by 
Encyclopedia of the Enlightenment by These are a selection of the subject dictionaries in our collection.
Words of Wisdom: A Philosophical Dictionary for the Perennial Tradition by 
A Dictionary of Continental Philosophy by The Cambridge History of Philosophy by 
Dictionary of Paradox by 
Historical Dictionary of Epistemology by 
The Oxford Companion to Philosophy by 
Key Concepts in Eastern Philosophy by Handbook of Western Philosophy by A Companion to the Philosophy of Mind by Wikipedia is not generally considered an appropriate source for academic research.
The credibility of the information is often questioned, as anyone is able to edit the pages.
Wikipedia can, however, be used as a starting point.
Check out the video below for more information: "Using Wikipedia for Academic Research"
