Reference Book. Ganguli. Vyasa's Mahabharata.

Comments: This English translation of the Mahabharata is incredibly valuable, especially because of the digitized text version at Sacred Texts.

Title: Mahabharata
Author: Vyasa
Translator: Kisari Mohan Ganguli
Year: 1883 and following

Online Sources (FREE):

Sacred Texts (with Sanskrit text also!)

Vol. 1: Books 1-3. Project Gutenberg, Kindle (free)
Vol. 2: Books 4-7. Project Gutenberg, Kindle (free)
Vol. 3: Books 8-12. Project Gutenberg, Kindle (free)
Vol. 4: Books 13-18. Project Gutenberg, Kindle (free)

Internet Archive
Hathi Trust
Google Books