Encyclopedia of the Renaissance. Ref. CB 361 .E52 1999 This six volume set is THE place to begin your research.
A Concise Encyclopaedia of the Italian Renaissance. Ref. DG 445 .C66
The Encyclopedia of the Renaissance. Ref. CB 361 .B43 1987
The Oxford Dictionary of the Renaissance. Ref. CB 361 .C27 2003
Dictionary of the Renaissance. Ref. CB 361 .S45
Grove Art Online This essay is a good place to explore your topic. Covers the Northern Renaissance too.
The Civilization of the Renaissance in Italy By Jacob Burkhart.
Art History: Renaissance This is good for biography and links to galleries.
Life in Italy - Look off to the left and you will see several sites on the Renaissance.
Web Gallery of Art - Arranged by artists.
Early Renaissance Arranged by artist; good for images.
High Renaissance Ditto.
The Renaissance Scroll down and you will see a section on art and architecture.
Guided Tours Covers 14 guided tours of the Italian and Northern European Renaissance.
Michelangelo Buonarroti This site is good for biography.
H-Italy Look off to the left and you will see discussion groups for art and architecture.
ARTHIST: h-net Information Network for Art History This site is more general. Use for Northern Renaissance also.
Glossary Useful for Northern Renaissance