Internet History Sourcebooks Project
Fordham University: Modern History Sourcebook: "The Spirit of Laws" (Excerpts) (1748)
Fordham University provides excerpts from the 1748 book of political philosophy by Montesquieu; "The Spirit of Laws".
University of Chicago
The Founders' Constitution: U. Of Chicago: Montesquieu Spirit of Laws
An excerpt from Montesquieu's "The Spirit of Laws" on his philosophy on democratic government and trade.
Other
Bristol University: The Spirit of the Laws [Pdf]
This resource presents the complete text by the famous 18th century French economist (in English). In it, he advanced theories of democracy for the French monarchy. It is in PDF format and is a large file.