Encyclopedia

You can use the below encyclopedia for your reference 

Interesting General reference Encyclopedia

Encylopedia	Language
Citizendium	English
Columbia Encyclopedia	English
Conservapedia	English
Digital Universe	English
Encyclopedia Sindhiana	Sindhi
Encyclopedia.com	English
Encyclopædia Britannica	English
Encyclopædia Britannica11th Edition	English
Everipedia	English
Everything2	English
Great Soviet Encyclopedia	Russian, English
Hamichlol	Hebrew, English
Internet Encyclopedia of Philosophy	English
Know Your Meme	English
Marathi Vishwakosh	Marathi
Rationalwiki	English
Sarvavijnanakosam	Malayalam
Scholarpedia	English
Tamil Encyclopedia	Tamil
The Canadian Encyclopedia	English, French

Art And Literature

Encylopedia	Language
Dictionary of Greek and Roman Antiquities	English
Dictionary of Greek and Roman Biography and Mythology	English
Dictionary of Greek and Roman Geography	English
Enciclopedia Dantesca	Italian
Encyclopedia Mythica	English
Harpers Dictionary of Classical Antiquities	English
Oxford Art Online	English
SIKART	English, German, French, Italian
The History of Nordic Women's Literature	English, Danish, Swedish
The Literary Encyclopedia	English

Mathematics

Encylopedia	Language
Encyclopedia of Mathematics	English
Encyclopedia of Triangle Centers	English
EqWorld	English, Russian
MathWorld	English
On-Line Encyclopedia of Integer Sequences	English