Reference Universe

Britannica Academic Edition
Updated daily. The combination of the Encyclopædia Britannica and Merriam-Webster’s Collegiate Dictionary and Thesaurus, magazines and periodicals, and many other research tools provides a variety of reliable sources.
Stanford Encyclopedia of Philosophy
This is considered to be the most authoritative encyclopedia covering the entire discipline of philosophy.
The Magistrates of the Roman Republic
by
Thomas Robert Shannon Broughton